Guam (; ch, Guåhan ) is an
organized, unincorporated territory of the United States in the
Micronesia subregion of the western
Pacific Ocean.
It is the
westernmost point and territory of the United States (reckoned from the
geographic center of the U.S.); its capital
Hagåtña (144°45'00"E) lies further west than
Melbourne, Australia (144°57'47"E). In
Oceania, Guam is the largest and southernmost of the
Mariana Islands
The Mariana Islands (; also the Marianas; in Chamorro: ''Manislan Mariånas'') are a crescent-shaped archipelago comprising the summits of fifteen longitudinally oriented, mostly dormant volcanic mountains in the northwestern Pacific Ocean, betw ...
and the largest island in
Micronesia. Guam's capital is
Hagåtña, and the most populous village is
Dededo.
People born on Guam are
American citizens but have
no vote in the
United States presidential elections while residing on Guam and Guam delegates to the
United States House of Representatives have no vote on the floor. Indigenous Guamanians are the
Chamoru, historically known as the
Chamorro, who are related to the
Austronesian
Austronesian may refer to:
*The Austronesian languages
*The historical Austronesian peoples
The Austronesian peoples, sometimes referred to as Austronesian-speaking peoples, are a large group of peoples in Taiwan, Maritime Southeast Asia, M ...
peoples of Indonesia, the
Philippines,
Malaysia,
Taiwan,
Micronesia, and
Polynesia. As of 2022, Guam's population is 168,801. Chamoros are the largest ethnic group, but a minority on the multi-ethnic island. The territory spans and has a population density of . The Chamoro people settled the island approximately 3,500 years ago. Portuguese explorer
Ferdinand Magellan, while in the service of Spain, was the first European to visit the island on March 6, 1521. Guam was colonized by
Spain in 1668. Between the 16th and 18th centuries, Guam was an important stopover for the Spanish
Manila Galleons. During the
Spanish–American War, the United States
captured Guam on June 21, 1898. Under the
Treaty of Paris, signed December 10, 1898, Spain ceded Guam to the U.S. effective April 11, 1899.
Before
World War II, Guam was one of five American jurisdictions in the Pacific Ocean, along with
Wake Island in Micronesia,
American Samoa and
Hawaii in Polynesia, and the Philippines. On December 8, 1941, hours after the
attack on Pearl Harbor,
Guam was captured by the
Japanese, who occupied the island for two and a half years. During the occupation, Guamanians were subjected to forced labor, incarceration, torture and execution.
American forces recaptured the island on July 21, 1944, which is commemorated as
Liberation Day.
Since the 1960s,
Guam's economy has been supported primarily by tourism and the
U.S. military
The United States Armed Forces are the military forces of the United States. The armed forces consists of six service branches: the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. The president of the United States is the ...
, for which Guam is a major strategic asset.
An unofficial but frequently used territorial motto is "Where America's Day Begins", which refers to the island's proximity to the
International Date Line
The International Date Line (IDL) is an internationally accepted demarcation on the surface of Earth, running between the South and North Poles and serving as the boundary between one calendar day and the next. It passes through the Pacific O ...
. Guam is among the 17
non-self-governing territories listed by the United Nations, and has been a member of the
Pacific Community since 1983
History
Pre-Contact era

Guam, along with the
Mariana Islands
The Mariana Islands (; also the Marianas; in Chamorro: ''Manislan Mariånas'') are a crescent-shaped archipelago comprising the summits of fifteen longitudinally oriented, mostly dormant volcanic mountains in the northwestern Pacific Ocean, betw ...
, were the first islands settled by humans in
Remote Oceania. Incidentally it is also the first and the longest of the ocean-crossing voyages of the
Austronesian peoples, and is separate from the later
Polynesian settlement of the rest of Remote Oceania. They were first settled around 1500 to 1400 BC by migrants departing from the
Philippines. This was followed by a second migration from the
Caroline Islands by the first millennium AD, and a third migration from
Island Southeast Asia
Maritime Southeast Asia comprises the countries of Brunei, Indonesia, Malaysia, the Philippines, Singapore, and East Timor. Maritime Southeast Asia is sometimes also referred to as Island Southeast Asia, Insular Southeast Asia or Oceanic Sout ...
(likely the Philippines or eastern
Indonesia) by 900 AD.
These original settlers of Guam and the
Northern Mariana Islands evolved into the
Chamoru people, historically known as Chamorros after first contact with the Spaniards.
The ancient Chamoru society had four classes: (chiefs), (upper class), (middle class), and (lower class).
The were located in the coastal villages, which meant they had the best access to fishing grounds, whereas the were located in the island's interior. and rarely communicated with each other, and often used as intermediaries. There were also "" or "", shamans with magical powers and "'" or "", healers who used different kinds of plants and natural materials to make medicine. Belief in spirits of ancient Chamorus called "" still persists as a remnant of pre-European culture. It is believed that "" or "" are the only ones who can safely harvest plants and other natural materials from their homes or "" without incurring the wrath of the "." Their society was organized along
matrilineal clans.
The Chamoru people raised colonnades of megalithic capped pillars called upon which they built their homes. Latte stones are stone pillars that are found only in the Mariana Islands; they are a recent development in Pre-Contact Chamoru society. The latte-stone was used as a foundation on which thatched huts were built.
Latte stones consist of a base shaped from limestone called the and with a capstone, or , made either from a large brain coral or limestone, placed on top.
A possible source for these stones, the
Rota Latte Stone Quarry
Rota Latte Stone Quarry, also known as the As Nieves quarry, is located near the Chamorro village of Sinapalo, on the island of Rota in the Marianas Archipelago. The prehistoric megaliths found there are believed to have been used as foundation p ...
, was discovered in 1925 on
Rota
Rota or ROTA may refer to:
Places
* Rota (island), in the Marianas archipelago
* Rota (volcano), in Nicaragua
* Rota, Andalusia, a town in Andalusia, Spain
* Naval Station Rota, Spain
People
* Rota (surname), a surname (including a list of peop ...
.
Spanish era

The first European to travel to Guam was Portuguese navigator
Ferdinand Magellan, sailing for the
King of Spain
, coatofarms = File:Coat_of_Arms_of_Spanish_Monarch.svg
, coatofarms_article = Coat of arms of the King of Spain
, image = Felipe_VI_in_2020_(cropped).jpg
, incumbent = Felipe VI
, incumbentsince = 19 Ju ...
, when he sighted the island on March 6, 1521, during his fleet's circumnavigation of the globe.
Despite Magellan's visit, Guam was not officially claimed by Spain until January 26, 1565, by
Miguel López de Legazpi
Miguel López de Legazpi (12 June 1502 – 20 August 1572), also known as '' El Adelantado'' and ''El Viejo'' (The Elder), was a Spaniard who, from the age of 26, lived and built a career in Mexico (then the Viceroyalty of New Spain) and, i ...
.
From 1565 to 1815, Guam and the Northern Mariana Islands, the only Spanish outposts in the Pacific Ocean east of the Philippines, were reprovisioning stops for the
Manila galleons, a fleet that covered the Pacific trade route between
Acapulco
Acapulco de Juárez (), commonly called Acapulco ( , also , nah, Acapolco), is a city and major seaport in the state of Guerrero on the Pacific Coast of Mexico, south of Mexico City. Acapulco is located on a deep, semicircular bay and has bee ...
and
Manila.
Spanish colonization commenced on June 15, 1668, with the arrival of a mission led by
Diego Luis de San Vitores
Diego Luis de San Vitores, SJ (November 12, 1627 – April 2, 1672) was a Spanish Jesuit missionary who founded the first Catholic church on the island of Guam. He is responsible for establishing the Christian presence in the Mariana Islands. He ...
, who established the first Catholic church.
The islands were part of the
Spanish East Indies, and in turn part of the
Viceroyalty of New Spain, based in
Mexico City.
The
Spanish-Chamorro Wars on Guam began in 1670 over growing tensions with the Jesuit mission, with the last large-scale uprising in 1683. Intermittent warfare, plus the typhoons of 1671 and 1693, and in particular the
smallpox epidemic of 1688, reduced the Chamoru population from 50,000 to 10,000, finally to less than 5,000.
Up until the late 19th century, Guam was encountered by adventurers from pirates including
Thomas Cavendish,
Olivier van Noort,
John Eaton,
William Dampier,
Woodes Rogers,
John Clipperton,
George Shelvocke
George Shelvocke (baptised 1 April 167530 November 1742) was an English Royal Navy officer and later privateer who in 1726 wrote ''A Voyage Round the World by Way of the Great South Sea'' based on his exploits. It includes an account of how his s ...
and
William "Bully" Hayes.
The island became a rest stop for
whalers starting in 1823.
A devastating typhoon struck the island on August 10, 1848, followed by a severe earthquake on January 25, 1849, which resulted in many refugees from the
Caroline Islands, victims of the resultant
tsunami.
After
a smallpox epidemic killed 3,644 Guamanians in 1856, Carolinians and Japanese were permitted to settle in the Marianas.
American era

After almost four centuries as part of the
Kingdom of Spain, the United States
occupied the island following Spain's defeat in the 1898
Spanish–American War, as part of the
Treaty of Paris of 1898. Guam was transferred to the
United States Navy control on December 23, 1898, by
Executive Order 108-A from 25th President
William McKinley.
Guam was a station for American merchants and warships traveling to and from the
Philippines (another American acquisition from Spain) while the
Northern Mariana Islands were sold by Spain to Germany for part of its rapidly expanding
German Empire
The German Empire (),Herbert Tuttle wrote in September 1881 that the term "Reich" does not literally connote an empire as has been commonly assumed by English-speaking people. The term literally denotes an empire – particularly a hereditary ...
. A U.S. Navy yard was established at
Piti in 1899, and a
United States Marine Corps barracks at
Sumay
Sumay, also Sumai, was a village on the United States territory of Guam. It was located on the north coast of the Orote Peninsula along Apra Harbor. It was inhabited by Chamorro people before contact with Europeans. Sumay became a prosperous port ...
in 1901.
[Rottman, G. (2004) ''Guam 1941 & 1944: Loss and Reconquest''. Oxford: Osprey Publishing, ] A marine seaplane unit was stationed in Sumay from 1921 to 1930, the first in the Pacific.
The
Commercial Pacific Cable Company built
a telegraph/telephone station in 1903 for the first trans-Pacific communications cable, followed by
Pan American World Airways established a seaplane base at Sumay for its trans-Pacific ''
China Clipper'' route.
World War II

During
World War II, the
Empire of Japan attacked and invaded in the
1941 Battle of Guam on December 8, at the same time as the
attack on Pearl Harbor. The Japanese renamed Guam (Great Shrine Island). The
Japanese occupation of Guam lasted about 31 months. During this period, the indigenous people of Guam were subjected to forced labor, family separation, incarceration, execution, concentration camps, and forced prostitution. Approximately 1,000 people died during the occupation, according to later US
Congressional
A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of ...
committee testimony in 2004. Some historians estimate that war violence killed 10% of Guam's then 20,000 population. The
United States returned and fought the
1944 Battle of Guam from July 21 to August 10, to recapture the island. July 21 is now a territorial holiday,
Liberation Day.
Post-war
After World War II, the
Guam Organic Act of 1950
The Guam Organic Act of 1950, ( ''et seq.'', ) is a United States federal law that redesignated the island of Guam as an unincorporated territory of the United States, established executive, legislative, and judicial branches, and transferred ...
established Guam as an
unincorporated organized territory of the United States, provided for the structure of the island's civilian government, and granted the people U.S. citizenship. The Governor of Guam was federally appointed until 1968 when the
Guam Elective Governor Act The Elective Governor Acts of 1968 are a pair of acts passed by the 90th United States Congress in 1968, which provide for the Governor of the U.S. Virgin Islands and the Governor of Guam to be popularly elected, rather than appointed as they had ...
provided for the office's popular election. Since Guam is not a U.S. state, U.S. citizens residing on Guam are not allowed to vote for president and their congressional representative is a non-voting member.
They do, however, get to vote for party delegates in presidential primaries.
In 1969,
a referendum on unification with the Northern Mariana Islands was held and rejected. During the 1970s, Dr.
Maryly Van Leer Peck started an engineering program, expanded
University of Guam, and founded
Guam Community College.
The removal of Guam's security clearance by President John F. Kennedy in 1963 allowed for the development of a
tourism industry. When the United States closed
U.S. Naval Base Subic Bay and
Clark Air Base
Clark Air Base is a Philippine Air Force base on Luzon Island in the Philippines, located west of Angeles City, about northwest of Metro Manila. Clark Air Base was previously a United States military facility, operated by the U.S. Air Forc ...
bases in the
Philippines after the expiration of their leases in the early 1990s, many of the forces stationed there were relocated to Guam.
The
1997 Asian financial crisis
The Asian financial crisis was a period of financial crisis that gripped much of East Asia and Southeast Asia beginning in July 1997 and raised fears of a worldwide economic meltdown due to financial contagion. However, the recovery in 1998–1 ...
, which hit Japan particularly hard, severely affected Guam's tourism industry. Military cutbacks in the 1990s also disrupted the island's economy. Economic recovery was further hampered by devastation from Supertyphoons
Paka
Paka may refer to:
Places Europe
* Paka (river), a river in northern Slovenia
* Paka, Mislinja, a settlement in the Municipality of Mislinja, Slovenia
* Paka pri Predgradu, a settlement in the Municipality of Kočevje, Slovenia
* Paka pri Velenj ...
in 1997 and
Pongsona in 2002, as well as the effects of the
September 11 terrorist attacks on tourism.
Geography and environment

Guam is long and wide, giving it an area of and making it the
32nd largest island of the United States. It is the southernmost and largest island in the
Mariana Island
The Mariana Islands (; also the Marianas; in Chamorro: ''Manislan Mariånas'') are a crescent-shaped archipelago comprising the summits of fifteen longitudinally oriented, mostly dormant volcanic mountains in the northwestern Pacific Ocean, betw ...
archipelago, as well as the largest in
Micronesia. Guam's
Point Udall Point Udall may refer to:
*Point Udall (Guam), named after Mo Udall and regarded as the westernmost point of the United States
*Point Udall (U.S. Virgin Islands)
Point Udall is at the east end of St. Croix in the U.S. Virgin Islands. It is th ...
is the
westernmost point of the U.S., as measured from the
geographic center of the United States.
The Mariana chain of which Guam is a part was created by collision of the Pacific and Philippine Sea
tectonic plates, with Guam located on the micro
Mariana Plate between the two. Guam is the closest land mass to the
Mariana Trench, the deep
subduction zone
Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the ...
that runs east of the Marianas. Volcanic eruptions established
the base of the island in the
Eocene, roughly 56 to 33.9 million years ago. The north of Guam is a result of this base being covered with layers of
coral reef, turning into
limestone, and then being thrust upward by tectonic activity to create a plateau. The rugged south of the island is a result of more recent volcanic activity.
Cocos Island off the southern tip of Guam is the largest of the many small
islets along the coastline. Guam's highest point is
Mount Lamlam at above sea level.
["Geography of Guam". ''Official site of Guam'', April 19, 2014. Retrieved April 19, 2014, from .] If its base is considered to be the nearby
''Challenger'' Deep, the deepest surveyed point in the
Oceans, Mount Lamlam is the
world's highest mountain at .
Politically, Guam is divided into
19 villages. The majority of the population lives on the coralline limestone plateaus of the north, with political and economic activity centered in the central and northern regions. The rugged geography of the south largely limits settlement to rural coastal areas. The western coast is
leeward
Windward () and leeward () are terms used to describe the direction of the wind. Windward is ''upwind'' from the point of reference, i.e. towards the direction from which the wind is coming; leeward is ''downwind'' from the point of reference ...
of the
trade winds and is the location of
Apra Harbor
Apra Harbor, also called Port Apra, is a deep-water port on the western side of the United States territory of Guam. It is considered one of the best natural ports in the Pacific Ocean. The harbor is bounded by Cabras Island and the Glass Breakwa ...
, the capital
Hagåtña, and the tourist center of
Tumon. The
U.S. Defense Department
The United States Department of Defense (DoD, USDOD or DOD) is an executive branch department of the federal government charged with coordinating and supervising all agencies and functions of the government directly related to national secur ...
owns about 29% of the island,
under the management of
Joint Region Marianas.
Climate

Guam has a
tropical rainforest climate (
Köppen ''Af''), though its driest month of March almost averages dry enough to qualify as a
tropical monsoon climate (Köppen ''Am''). The weather is generally hot and humid throughout the year with little seasonal temperature variation. Hence, Guam is known to have equable temperatures year-round.
Trade winds are fairly constant throughout the year, but there is often a weak westerly monsoon influence in summer. Guam has two distinct seasons: Wet and dry season. The dry season runs from January through May and June being the transitional period. The wet season runs from July through November with an average annual rainfall between 1981 and 2010 of around . The wettest month on record at Guam Airport has been August 1997 with and the driest was February 2015 with . The wettest calendar year has been 1976 with and the driest was in 1998 with . The most rainfall in a single day occurred on October 15, 1953, when fell.
The mean high temperature is and mean low is . Temperatures rarely exceed or fall below . The
relative humidity commonly exceeds 84 percent at night throughout the year, but the average monthly humidity hovers near 66 percent. The highest temperature ever recorded in Guam was on April 18, 1971, and April 1, 1990. A record low of was set on February 1, 2021, while the lowest recorded temperature was 65 °F (18.3 °C), set on February 8, 1973.
Guam lies in the path of
typhoons and it is common for the island to be threatened by tropical storms and possible typhoons during the wet season. The highest risk of typhoons is from August through November, where typhoons and tropical storms are most probable in the western Pacific. They can, however, occur year-round. Typhoons that have caused major damage on Guam in the American period include the
Typhoon of 1900,
Karen (1962),
Pamela (1976),
Paka
Paka may refer to:
Places Europe
* Paka (river), a river in northern Slovenia
* Paka, Mislinja, a settlement in the Municipality of Mislinja, Slovenia
* Paka pri Predgradu, a settlement in the Municipality of Kočevje, Slovenia
* Paka pri Velenj ...
(1997), and
Pongsona (2002).
Since
Typhoon Pamela in 1976, wooden structures have been largely replaced by concrete structures. During the 1980s, wooden utility poles began to be replaced by typhoon-resistant concrete and steel poles. After the local Government enforced stricter construction codes, many home and business owners built their structures out of reinforced concrete with installed
typhoon shutters.
Ecology

Guam has experienced severe impacts from
invasive species
An invasive species otherwise known as an alien is an introduced organism that becomes overpopulated and harms its new environment. Although most introduced species are neutral or beneficial with respect to other species, invasive species ad ...
upon the natural
biodiversity of the island. These include the
local extinction
Local extinction, also known as extirpation, refers to a species (or other taxon) of plant or animal that ceases to exist in a chosen geographic area of study, though it still exists elsewhere. Local extinctions are contrasted with global extinct ...
of endemic bird species after the introduction of the
brown tree snake, an infestation of the
Asiatic rhinoceros beetle
The Asiatic rhinoceros beetle, coconut rhinoceros beetle or coconut palm rhinoceros beetle, (''Oryctes rhinoceros'') is a species of rhinoceros beetle of the family Scarabaeidae. ''O. rhinoceros'' attacks the developing fronds of raffia, coconu ...
destroying
coconut
The coconut tree (''Cocos nucifera'') is a member of the palm tree family ( Arecaceae) and the only living species of the genus ''Cocos''. The term "coconut" (or the archaic "cocoanut") can refer to the whole coconut palm, the seed, or the ...
palms, and the effect of introduced
feral mammal
Mammals () are a group of vertebrate animals constituting the class Mammalia (), characterized by the presence of mammary glands which in females produce milk for feeding (nursing) their young, a neocortex (a region of the brain), fur or ...
s and
amphibian
Amphibians are tetrapod, four-limbed and ectothermic vertebrates of the Class (biology), class Amphibia. All living amphibians belong to the group Lissamphibia. They inhabit a wide variety of habitats, with most species living within terres ...
s.
Wildfires plague the forested areas of Guam every
dry season despite the island's humid climate. Most fires are caused by humans with 80% resulting from
arson
Arson is the crime of willfully and deliberately setting fire to or charring property. Although the act of arson typically involves buildings, the term can also refer to the intentional burning of other things, such as motor vehicles, wat ...
. Poachers often start fires to attract deer to the new growth. Invasive grass species that rely on fire as part of their natural life cycle grow in many regularly burned areas. Grasslands and "barrens" have replaced previously forested areas leading to greater soil erosion. During the rainy season, sediment is carried by the heavy rains into the
Fena Lake Reservoir and
Ugum River, leading to water quality problems for southern Guam. Eroded silt also destroys the marine life in reefs around the island. Soil stabilization efforts by volunteers and forestry workers (planting trees) have had little success in preserving natural habitats.

Efforts have been made to protect Guam's coral reef habitats from pollution, eroded silt and overfishing, problems that have led to decreased fish populations. This has both ecological and economic value, as Guam is a significant
vacation spot for scuba divers, and one study found that Guam's reefs are worth $127 million per year. In recent years, the Department of Agriculture, Division of Aquatic and Wildlife Resources has established several new marine preserves where fish populations are monitored by biologists. These are located at
Pati Point,
Piti Bomb Holes,
Sasa Bay,
Achang Reef Flat
The Achang (), also known as the Ngac'ang (their own name) is an ethnic group.They are one of tibeto burman language speaking people. They form one of the 56 ethnic groups officially recognized by the People's Republic of China. They also live i ...
, and
Tumon Bay. Before adopting
U.S. Environmental Protection Agency standards, portions of Tumon Bay were dredged by the hotel chains to provide a better experience for hotel guests. Tumon Bay has since been made into a preserve. A federal
Guam National Wildlife Refuge in northern Guam protects the decimated
sea turtle population in addition to a small colony of
Mariana fruit bats.
Harvest of sea turtle eggs was a common occurrence on Guam before World War II. The
green sea turtle
The green sea turtle (''Chelonia mydas''), also known as the green turtle, black (sea) turtle or Pacific green turtle, is a species of large sea turtle of the family Cheloniidae. It is the only species in the genus ''Chelonia''. Its range exten ...
(''Chelonia mydas'') was harvested legally on Guam before August 1978, when it was listed as threatened under the Endangered Species Act. The
hawksbill sea turtle
The hawksbill sea turtle (''Eretmochelys imbricata'') is a critically endangered sea turtle belonging to the family Cheloniidae. It is the only extant species in the genus ''Eretmochelys''. The species has a global distribution, that is largel ...
(''Eretmochelys imbricata'') has been on the endangered list since 1970. In an effort to ensure the protection of sea turtles on Guam, routine sightings are counted during aerial surveys and nest sites are recorded and monitored for hatchlings.
Demographics
According to the
2010 United States Census
The United States census of 2010 was the twenty-third United States national census. National Census Day, the reference day used for the census, was April 1, 2010. The census was taken via mail-in citizen self-reporting, with enumerators servin ...
, the largest ethnic group were the native
Chamorus, accounting for 37.3% of the total population. Asians (including Filipinos, Koreans, Chinese, and Japanese) accounted for 33% of the total population. Other ethnic groups of
Micronesia (including those of
Chuukese,
Palauan, and
Pohnpeians) accounted for 10%; 9.4% of the population were
multiracial
Mixed race people are people of more than one race or ethnicity. A variety of terms have been used both historically and presently for mixed race people in a variety of contexts, including ''multiethnic'', ''polyethnic'', occasionally ''bi-ethn ...
(two or more races); and
White Americans made up 7.1% of the total population. The estimated interracial marriage rate is over 40%.
The official languages of the island are English and
Chamoru Filipino is also commonly spoken across the island. Other Pacific and Asian languages are spoken in Guam as well.
Spanish, which was the language of administration for 300 years, influenced the Chamoru language.
The predominant religion of Guam is
Christianity. Three-quarters of the population adheres to
Roman Catholicism
The Catholic Church, also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.3 billion baptized Catholics Catholic Church by country, worldwide . It is am ...
, while most of the remainder belong to
Protestant churches. According to the
Pew Research Center
The Pew Research Center is a nonpartisan American think tank (referring to itself as a "fact tank") based in Washington, D.C.
It provides information on social issues, public opinion, and demographic trends shaping the United States and the w ...
, the religious demography of Guam in 2010 was as follows:
*
Roman Catholicism
The Catholic Church, also known as the Roman Catholic Church, is the List of Christian denominations by number of members, largest Christian church, with 1.3 billion baptized Catholics Catholic Church by country, worldwide . It is am ...
: 75%
*
Protestantism: 17.7%
* Other religions: 1.6%
* Folk religions: 1.5%
* Other Christianity: 1.4%
*
Buddhism: 1.1%
*
Eastern Orthodoxy: <1%
*
Hinduism: <1%
*
Islam
Islam (; ar, ۘالِإسلَام, , ) is an Abrahamic religions, Abrahamic Monotheism#Islam, monotheistic religion centred primarily around the Quran, a religious text considered by Muslims to be the direct word of God in Islam, God (or ...
: <1%
*
Judaism: <1%
Culture

The culture of Guam is a reflection of traditional
Chamoru customs in combination with American, Spanish and Mexican traditions. Post-European-contact
Chamoru Guamanian culture is a combination of American, Spanish, Filipino, other Micronesian Islander and Mexican traditions. Few indigenous pre-Hispanic customs remained following Spanish contact but include plaiting and pottery, and there has been a resurgence of interest among the Chamoru to preserve the language and culture. Hispanic influences are manifested in the local language, music, dance, sea navigation, cuisine, fishing, games (such as , , , and ), songs, and fashion. The island's original community is of Chamorro natives who have inhabited Guam for almost 4000 years. They had their own language related to the languages of Indonesia and southeast Asia. The Spanish later called them Chamorros (a derivative of the word Chamorri is "noble race"). They began to grow rice on the island.

Historically, the native people of Guam venerated the bones of their ancestors, keeping the skulls in their houses in small baskets, and practicing incantations before them when it was desired to attain certain objects. During Spanish rule (1668–1898) the majority of the population was converted to
Catholicism and religious festivities such as Easter and Christmas became widespread. Many Chamorus have
Spanish surnames
Spanish names are the traditional way of identifying, and the official way of registering, a person in Spain. They comprise a given name (simple or composite) and two surnames (the first surname of each parent). Traditionally, the first surname ...
, although few of the inhabitants are themselves descended from the Spaniards. Instead, Spanish names and surnames became commonplace after their conversion to Catholicism and the imposition of the
Catálogo alfabético de apellidos in Guam. Historically, the diet of the native inhabitants of Guam consisted of fish, fowl, rice,
breadfruit
Breadfruit (''Artocarpus altilis'') is a species of flowering tree in the mulberry and jackfruit family (Moraceae) believed to be a domesticated descendant of ''Artocarpus camansi'' originating in New Guinea, the Maluku Islands, and the Philippi ...
,
taro,
yams, bananas, and coconuts used in a variety of dishes. Post-contact Chamoru cuisine is largely based on corn, and includes tortillas, tamales, atole, and chilaquiles, which are a clear influence from
Mesoamerica, principally Mexico, from Spanish trade with Asia.
Due to foreign cultural influence from Spain, most aspects of the early indigenous culture have been lost, though there has been a resurgence in preserving any remaining pre-Hispanic culture in the last few decades. Some scholars have traveled throughout the Pacific Islands conducting research to study what the original Chamoru cultural practices such as dance, language, and canoe building may have been like.
Sports

Guam's most popular sport is
American football, followed by
basketball and
baseball respectively.
Soccer
Association football, more commonly known as football or soccer, is a team sport played between two teams of 11 players who primarily use their feet to propel the ball around a rectangular field called a pitch. The objective of the game is ...
and other sports are also somewhat popular. Guam hosted the
Pacific Games in
1975
It was also declared the ''International Women's Year'' by the United Nations and the European Architectural Heritage Year by the Council of Europe.
Events
January
* January 1 - Watergate scandal (United States): John N. Mitchell, H. R. ...
and
1999
File:1999 Events Collage.png, From left, clockwise: The funeral procession of King Hussein of Jordan in Amman; the 1999 İzmit earthquake kills over 17,000 people in Turkey; the Columbine High School massacre, one of the first major school shootin ...
. At the
2007 Games, Guam finished 7th of 22 countries in the medal count, and 14th at the
2011 Games.
Guam men's national basketball team and the
women's team
A woman is an adult female human. Prior to adulthood, a female human is referred to as a girl (a female child or adolescent). The plural ''women'' is sometimes used in certain phrases such as "women's rights" to denote female humans regardle ...
are traditional powerhouses in the
Oceania region, behind the
Australia men's national basketball team and the
New Zealand national basketball team
The New Zealand men's national basketball team is the senior men's national basketball team of New Zealand. The team is nicknamed the Tall Blacks. The ''Tall Blacks'' name is one of many New Zealand national team nicknames related to the ...
. , the men's team is the reigning champion of the
Pacific Games Basketball Tournament. Guam is home to various basketball organizations, including the
Guam Basketball Association The Guam Basketball Association (GBA) is a men's professional basketball league in the United States territory of Guam. Promoted by the Guam Basketball Confederation, it is the tiny island-nation's FIBA-recognized basketball league.
History
The GBA ...
.
The
Guam national football team was founded in 1975 and joined
FIFA
FIFA (; stands for ''Fédération Internationale de Football Association'' ( French), meaning International Association Football Federation ) is the international governing body of association football, beach football and futsal. It was found ...
in 1996. It was once considered one of FIFA's weakest teams, and experienced their first victory over a FIFA-registered side in 2009. Guam hosted qualifying games on the island for the first time in 2015 and, in 2018, clinched their first
FIFA World Cup Qualifying win. The
Guam national rugby union team played its first match in 2005 and has never qualified for a
Rugby World Cup.
Economy

Guam's economy depends primarily on tourism, Department of Defense installations and locally owned businesses. Under the provisions of a special law by
Congress, it is Guam's treasury rather than the U.S. treasury that receives the federal income taxes paid by local taxpayers (including military and civilian federal employees assigned to Guam).
[Lin, Tom C.W.]
Americans, Almost and Forgotten
, 107 California Law Review (2019)
Tourism
Lying in the western Pacific, Guam is a popular destination for Japanese tourists. Its tourist hub,
Tumon, features over 20 large hotels, a Duty Free Shoppers Galleria, Pleasure Island district, indoor aquarium, Sandcastle
Las Vegas–styled shows and other shopping and entertainment venues. It is a relatively short flight from Asia or Australia compared to Hawaii, with hotels and seven public golf courses accommodating over a million tourists per year. Although 75% of the tourists are Japanese, Guam also receives a sizable number of tourists from South Korea, the U.S., the Philippines, and Taiwan. Significant sources of revenue include
duty-free designer shopping outlets, and the American-style malls:
Micronesia Mall,
Guam Premier Outlets, the
Agana Shopping Center
Agana Shopping Center is a shopping center located in downtown Hagåtña, in the United States territory of Guam. Opening in 1978, the mall is one of numerous malls on Guam. Main competitors include Micronesia Mall, Guam's largest shopping mall an ...
, and the world's largest
Kmart.

The economy had been stable since 2000 due to increased tourism. It was expected to stabilize with the transfer of U.S. Marine Corps'
3rd Marine Expeditionary Force
III Marine Expeditionary Force (III MEF) is a formation of the Marine Air-Ground Task Force of the United States Marine Corps. It is forward-deployed and able to rapidly conduct operations across the spectrum from humanitarian assistance and d ...
, currently in
Okinawa, Japan (approximately 8,000 Marines, along with their 10,000 dependents), to Guam between 2010 and 2015. However, the move was delayed until late 2020, the number of marines decreased to 5,000, and expected to be complete in 2025.
In 2003, Guam had a 14% unemployment rate, and the government suffered a $314 million shortfall.
As of 2019 the unemployment rate had dropped to 6.1%. By September 2020, however, the unemployment rate had risen again to 17.9%.
The
Compacts of Free Association between the United States, the
Federated States of Micronesia, the Republic of the
Marshall Islands, and the Republic of
Palau accorded the former entities of the
Trust Territory of the Pacific Islands a political status of "free association" with the United States. The Compacts give citizens of these island nations generally no restrictions to reside in the United States (also its territories), and many were attracted to Guam due to its proximity, environmental, and cultural familiarity. Over the years, it was claimed by some in Guam that the territory has had to bear the brunt of this agreement in the form of public assistance programs and public education for those from the regions involved, and the federal government should compensate the states and territories affected by this type of migration. Over the years, Congress had appropriated "Compact Impact" aids to Guam, the
Northern Mariana Islands, and Hawaii, and eventually this appropriation was written into each renewed Compact. Some, however, continue to claim the compensation is not enough or that the distribution of actual compensation received is significantly disproportionate.
Guam's largest single private sector employer, with about 1,400 jobs, was
Continental Micronesia, a subsidiary of
Continental Airlines
Continental Airlines, simply known as Continental, was a major United States airline founded in 1934 and eventually headquartered in Houston, Texas. It had ownership interests and brand partnerships with several carriers.
Continental started o ...
; it is now a part of
United Airlines, a subsidiary of Chicago-based United Airlines Holdings, Inc. the Continental Micronesia annual payroll in Guam was $90 million.
Military bases

Currently,
Joint Region Marianas maintains jurisdiction over installations which cover approximately , or 29% of the island's total land area. These include:
* U.S.
Naval Base Guam,
U.S. Navy (Santa Rita), comprising the
Orote Peninsula, additional lands, and with jurisdiction of the majority of
Apra Harbor
Apra Harbor, also called Port Apra, is a deep-water port on the western side of the United States territory of Guam. It is considered one of the best natural ports in the Pacific Ocean. The harbor is bounded by Cabras Island and the Glass Breakwa ...
*
Andersen Air Force Base
Andersen Air Force Base (Andersen AFB, AAFB) is a United States Air Force base located primarily within the village of Yigo in the United States territory of Guam. The host unit at Andersen AFB is the 36th Wing (36 WG), assigned to the Pacific ...
,
U.S. Air Force (Yigo), including
Northwest Field
*
Marine Corps Base Camp Blaz,
U.S. Marine Corps
The United States Marine Corps (USMC), also referred to as the United States Marines, is the maritime land force service branch of the United States Armed Forces responsible for conducting expeditionary and amphibious operations through comb ...
(Dededo)
*
Ordnance Annex
Ordnance Annex is a US naval base in the United States territory of Guam. It used to be known as Naval Magazine, Guam. The base is on the south-central section of the island. It occupies an area of .
The entirety of the man-made Fena Lake, whi ...
, U.S. Navy – South Central Highlands (formerly known as Naval Magazine)
*
Naval Computer and Telecommunications Station Guam, U.S. Navy (Dededo), sometimes referred to "NCTS Finegayan"
*
Naval Radio Station Barrigada
Radio Barrigada, formally Communications Site Barrigada and previously Communications Annex Barrigada, refers to two adjacent U.S. military transmitter facilities located in the villages of Barrigada and Mangilao on the western Pacific territory o ...
(Barrigada), often referred to as "Radio Barrigada"
*
Joint Region Marianas Headquarters (Asan), at
Nimitz Hill Annex
*
Naval Hospital Guam (Agana Heights)
* South Finegayan (Dededo), a military housing complex
* Andersen South (Yigo), formerly
Marine Barracks Guam
Marine is an adjective meaning of or pertaining to the sea or ocean.
Marine or marines may refer to:
Ocean
* Maritime (disambiguation)
* Marine art
* Marine biology
* Marine debris
* Marine habitats
* Marine life
* Marine pollution
Military
* ...
until its closure in 1992
*
Fort Juan Muña
A fortification is a military construction or building designed for the defense of territories in warfare, and is also used to establish rule in a region during peacetime. The term is derived from Latin ''fortis'' ("strong") and ''facere'' ...
,
Guam National Guard (Tamuning)
The U.S. military proposed building a new aircraft carrier berth on Guam and moving 8,600 Marines, and 9,000 of their dependents, to Guam from
Okinawa, Japan. Including the required construction workers, this buildup would increase Guam's population by a total of 79,000, a 49% increase over its 2010 population of 160,000. In a February 2010 letter, the
United States Environmental Protection Agency sharply criticized these plans because of a water shortfall, sewage problems and the impact on coral reefs. As of 2022, the Marine Corps has decided to place 5,000 Marines on the island within the first half of the 2020s, with 1300 already stationed on the base.
Government and politics

Guam is governed by a popularly elected
governor and a
unicameral 15-member
legislature, whose members are known as senators. Its judiciary is overseen by the
Supreme Court of Guam.
The
District Court of Guam is the court of United States federal jurisdiction in the territory. Guam elects one
delegate to the United States House of Representatives, currently Democrat
Michael San Nicolas. The delegate does not have a vote on the final passage of legislation, but is accorded a vote in committee, and the privilege to speak to the House. U.S. citizens in Guam vote in a
presidential straw poll for their choice in the U.S. presidential general election, but since Guam has no votes in the
Electoral College, the poll has no real effect. However, in sending delegates to the Republican and Democratic national conventions, Guam does have influence in the national presidential race. These delegates are elected by local party
conventions
Convention may refer to:
* Convention (norm), a custom or tradition, a standard of presentation or conduct
** Treaty, an agreement in international law
* Convention (meeting), meeting of a (usually large) group of individuals and/or companies in a ...
.
Political status

In the 1980s and early 1990s, there was a significant movement in favor of this U.S. territory becoming a
commonwealth
A commonwealth is a traditional English term for a political community founded for the common good. Historically, it has been synonymous with "republic". The noun "commonwealth", meaning "public welfare, general good or advantage", dates from the ...
, which would give it a level of self-government similar to
Puerto Rico and the
Northern Mariana Islands.
In a 1982 plebiscite, voters indicated interest in seeking commonwealth status. However, the federal government rejected the version of a commonwealth that the government of Guam proposed, because its clauses were incompatible with the
Territorial Clause (Art. IV, Sec. 3, cl. 2) of the
U.S. Constitution. Other movements advocate U.S. statehood for Guam, union with the state of Hawaii, or union with the Northern Mariana Islands as a single territory, or independence.
A Commission on Decolonization was established in 1997 to educate the people of Guam about the various political status options in its relationship with the U.S.: statehood, free association, and independence. The island has been considering another non-binding plebiscite on decolonization since 1998; however, the group was dormant for some years. In 2013, the commission began seeking funding to start a public education campaign. There were few subsequent developments until late 2016. In early December 2016, the Commission scheduled a series of education sessions in various villages about the current status of Guam's relationship with the U.S. and the self-determination options that might be considered.
The commission's current executive director is Edward Alvarez and there are ten members. The group is also expected to release position papers on independence and statehood but the contents have not yet been completed.
The
United Nations is in favor of greater self-determination for Guam and other such territories. The UN's
Special Committee on Decolonization has agreed to endorse the Governor's education plan. The commission's May 2016 report states: "With academics from the University of Guam,
he Commission
He or HE may refer to:
Language
* He (pronoun), an English pronoun
* He (kana), the romanization of the Japanese kana へ
* He (letter), the fifth letter of many Semitic alphabets
* He (Cyrillic), a letter of the Cyrillic script called ''He'' i ...
was working to create and approve educational materials. The Office of the Governor was collaborating closely with the Commission" in developing educational materials for the public.
The United States
Department of the Interior
The United States Department of the Interior (DOI) is one of the executive departments of the U.S. federal government headquartered at the Main Interior Building, located at 1849 C Street NW in Washington, D.C. It is responsible for the mana ...
had approved a $300,000 grant for decolonization education, Edward Alvarez told the United Nations Pacific Regional Seminar in May 2016. "We are hopeful that this might indicate a shift in
nited States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territorie ...
policy to its Non-Self-Governing Territories such as Guam, where they will be more willing to engage in discussions about our future and offer true support to help push us towards true self-governances and self-determination."
On July 31, 2020, the
Government of Guam
The Government of Guam (GovGuam) is a presidential representative democratic system, whereby the President is the head of state and the Governor is head of government, and of a multi-party system. Guam is an organized, unincorporated terri ...
joined the
Unrepresented Nations and Peoples Organization (UNPO).
Villages

Guam is divided into 19 municipal villages:
*
Agana Heights
*
Asan‑Maina
*
Barrigada
*
Chalan Pago‑Ordot
*
Dededo
*
Hågat
*
Hagåtña
*
Humåtak
*
Inalåhan
*
Malesso
*
Mangilao
*
Mongmong‑Toto‑Maite
*
Piti
*
Sånta Rita-Sumai
*
Sinajana
*
Talo'fo'fo
*
Tamuning
*
Yigo
*
Yona
Transportation and communications

Most of the island has state-of-the-art mobile phone services and high-speed internet widely available through either cable or
DSL. Guam was added to the
North American Numbering Plan (NANP) in 1997 (country code 671 became NANP
area code 671), removing the barrier of high-cost international long-distance calls to the
U.S. mainland.
Guam is also a major hub for submarine cables between the Western U.S., Hawaii, Australia and Asia. Guam currently serves twelve submarine cables, with most continuing to China. In 2012 ''
Slate
Slate is a fine-grained, foliated, homogeneous metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low-grade regional metamorphism. It is the finest grained foliated metamorphic rock. ...
'' stated that the island has "tremendous bandwidth" and internet prices comparable to those of the U.S. Mainland due to being at the junction of undersea cables.
In 1899, the local postage stamps were overprinted "Guam" as was done for the other former Spanish colonies, but this was discontinued shortly thereafter and regular U.S. postage stamps have been used ever since. Because Guam is also part of the U.S. Postal System (
postal abbreviation: GU,
ZIP code range: 96910–96932), mail to Guam from the U.S. mainland is considered domestic and no additional charges are required. Private shipping companies, such as FedEx, UPS, and DHL, however, have no obligation to do so, and do not regard Guam as domestic.
The speed of mail traveling between Guam and the states varies depending on size and time of year. Light, first-class items generally take less than a week to or from the mainland, but larger first-class or Priority items can take a week or two. Fourth-class mail, such as magazines, are transported by sea after reaching Hawaii. Most residents use post office boxes or private mail boxes, although residential delivery is becoming increasingly available. Incoming mail not from the Americas should be addressed to "Guam" instead of "USA" to avoid being routed the long way through the U.S. mainland and possibly charged a higher rate (especially from Asia).

The
Port of Guam is the island's lifeline because most products must be shipped into Guam for consumers. It receives the weekly calls of the Hawaii-based shipping line
Matson, Inc.
Matson, Inc. is an American shipping and navigation services company headquartered in Honolulu, Hawaii. Founded in 1882, Matson, Inc.'s subsidiary Matson Navigation Company provides ocean shipping services across the Pacific to Hawaii, Alaska, G ...
whose container ships connect Guam with Honolulu, Hawaii; Los Angeles, California; Oakland, California and Seattle, Washington. The port is also the regional transhipment hub for over 500,000 customers throughout the Micronesian region. The port is the shipping and receiving point for containers designated for the island's U.S. Department of Defense installations, Andersen Air Force Base and Commander, Naval Forces Marianas and eventually the Third Marine Expeditionary Force.
Guam is served by the
Antonio B. Won Pat International Airport
Antonio B. Won Pat International Airport , also known as Guam International Airport, is an airport located in Tamuning and Barrigada, east of the capital city of Hagåtña (formerly Agana) in the United States territory of Guam. The airport is ...
. The island is outside the United States customs zone, so Guam is responsible for establishing and operating its own customs and quarantine agency and jurisdiction. Therefore, the
U.S. Customs and Border Protection only carries out immigration (but not customs) functions. Since Guam is under federal immigration jurisdiction, passengers arriving directly from the United States skip immigration and proceed directly to Guam Customs and Quarantine.
However, due to the
Guam and CNMI visa waiver program for certain countries, an eligibility pre-clearance check is carried on Guam for flights to the States. For travel from the Northern Mariana Islands to Guam, a pre-flight passport and visa check is performed before boarding the flight to Guam. On flights from Guam to the Northern Mariana Islands, no immigration check is performed. Traveling between Guam and the States through a foreign point, however, does require a passport.
Most residents travel within Guam using personally owned vehicles. The
Guam Regional Transit Authority
The Guam Region Transit Authority is the only public transportation agency in the United States territory of Guam
Guam (; ch, Guåhan ) is an organized, unincorporated territory of the United States in the Micronesia subregion of the wester ...
provides fixed route bus and paratransit services, and some commercial companies operate buses between tourist-frequented locations.
Education
Guam Public Library System operates the Nieves M. Flores Memorial Library in
Hagåtña and five branch libraries.
The
Guam Department of Education serves the entire island of Guam. In 2000, 32,000 students attended Guam's public schools, including 26 elementary schools, eight middle schools, and six high schools and alternative schools. Guam Public Schools have struggled with problems such as high dropout rates and poor test scores.
Guam's educational system has always faced unique challenges as a small community located from the U.S. mainland with a very diverse student body including many students who come from backgrounds without traditional American education.
An economic downturn in Guam since the mid-1990s has compounded the problems in schools.
Before September 1997, the
U.S. Department of Defense partnered with Guam Board of Education. In September 1997, the
Department of Defense Education Activity
The Department of Defense Education Activity (DoDEA) is a federal school system headquartered in Alexandria, Virginia, responsible for planning, directing, coordinating, and managing prekindergarten through 12th grade educational programs on behal ...
(DoDEA) opened its own schools for children of military personnel. DoDEA schools, which also serve children of some federal civilian employees, had an attendance of 2,500 in 2000. DoDEA Guam operates three elementary/middle schools and
one high school.
The
University of Guam (UOG) and
Guam Community College, both fully accredited by the
Western Association of Schools and Colleges, offer courses in higher education. UOG is a member of the exclusive group of only 106
land-grant institutions in the entire United States.
Pacific Islands University is a small Christian liberal arts institution nationally accredited by the
Transnational Association of Christian Colleges and Schools.
Health care
The Government of Guam maintains the island's main health care facility,
Guam Memorial Hospital, in
Tamuning. U.S. board certified doctors and dentists practice in all specialties. In addition, the
U.S. Naval Hospital in
Agana Heights serves active-duty members and dependents of the military community. There is one subscriber-based
air ambulance located on the island, CareJet, which provides emergency patient transportation across Guam and surrounding islands. A private hospital, the
Guam Regional Medical City, opened its doors in early 2016.
Medicaid is accepted in Guam.
See also
*
51st state
51st state in American political discourse refers to areas considered candidates for U.S. statehood, joining the 50 states that have constituted the United States since 1959. The phrase has been applied to external territories as well as parts o ...
*
Index of Guam-related articles
*
Lists of hospitals in the United States#Insular areas
*
List of people from Guam
Numerous notable people have lived in or come from Guam.
Entertainment
* Sabrina Iren Krasniqi
* Jason Barnes
* Nathaniel Berg
*Q. Allan Brocka
*Ann Curry
* Dan Ho
*Pia Mia
*Donovan Patton
*DPR Live
Games and athletics
*Morgan Hikaru Aiken
*Fran ...
*
Outline of Guam
*
Voting in Guam
Voting rights of citizens in Guam differ from those of United States citizens in each of the fifty states. In the U.S. House of Representatives, Guam is entitled to a delegate, who is not allowed to vote on the floor of the House, but can vote on ...
Notes
References
Further reading
* Maga, Timothy P. ''Defending Paradise: The United States and Guam, 1898–1950'' (Garland, 1988).
* Rogers, Robert F. ''Destiny's Landfall: A History of Guam'' (U of Hawaii Press, 1995).
* Spear, Jane E. "Guamanian Americans." ''Gale Encyclopedia of Multicultural America,'' edited by Thomas Riggs, (3rd ed., vol. 2, Gale, 2014), pp. 263–273
online
External links
*
Guampedia, Guam's Online Encyclopedia"Guam Society of America" fosters the CHamoru language, culture, and traditions
''The Insular Empire: America in the Mariana Islands'' PBS documentary film website.
Guam ''
The World Factbook''.
Central Intelligence Agency.
U.S. Census Bureau: Island Areas Census 2000*
from the U.S.
Library of Congress.
*
*
Guam Census
{{Authority control
1898 establishments in Oceania
English-speaking countries and territories
Former Spanish colonies
Geography of Micronesia
Insular areas of the United States
Island countries
Islands of Oceania
Members of the Unrepresented Nations and Peoples Organization
Pacific islands of the United States
Small Island Developing States
States and territories established in 1898
World War II sites