Southern Arizona is a region of the
United 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 Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
comprising the southernmost portion of the
State of Arizona
Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Four Co ...
. It sometimes goes by the name Gadsden or Baja Arizona, which means "Lower Arizona" in Spanish.
Geography
Although Southern Arizona's boundaries are not well-defined, it is generally considered to include all areas south of the
Gila River
The Gila River (; O'odham ima Keli Akimel or simply Akimel, Quechan: Haa Siʼil, Maricopa language: Xiil) is a tributary of the Colorado River flowing through New Mexico and Arizona in the United States. The river drains an arid watershed of ...
but sometimes only
Cochise County
Cochise County () is a county in the southeastern corner of the U.S. state of Arizona. It is named after the Native American chief Cochise.
The population was 125,447 at the 2020 census. The county seat is Bisbee and the most populous city ...
,
Pima County
Pima County ( ) is a county in the south central region of the U.S. state of Arizona. As of the 2020 census, the population was 1,043,433, making it Arizona's second-most populous county. The county seat is Tucson, where most of the populati ...
and
Santa Cruz County, anchored by the city of
Tucson
, "(at the) base of the black ill
, nicknames = "The Old Pueblo", "Optics Valley", "America's biggest small town"
, image_map =
, mapsize = 260px
, map_caption = Interactive map ...
. Other cities and large towns in Southern Arizona include
Ajo,
Casa Grande
, settlement_type = City
, image_skyline = Casa Grande-Casa Grande Union High School-1920-2.jpg
, imagesize = 250px
, image_caption = Historic Casa Grande Union High School which now serves as the ...
,
Gila Bend,
Oro Valley,
Sierra Vista
Sierra Vista is a city in Cochise County, Arizona, United States. According to the 2020 Census, the population of the city is 45,308, and is the 27th most populous city in Arizona. The city is part of the Sierra Vista-Douglas Metropolitan Area ...
,
Yuma, and the border cities of
Nogales and
Douglas
Douglas may refer to:
People
* Douglas (given name)
* Douglas (surname)
Animals
*Douglas (parrot), macaw that starred as the parrot ''Rosalinda'' in Pippi Longstocking
* Douglas the camel, a camel in the Confederate Army in the American Civil ...
.
Furthermore, the populated areas of Southern Arizona include the major
U.S. Army
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
post of
Fort Huachuca
Fort Huachuca is a United States Army installation, established on 3 March 1877 as Camp Huachuca. The garrison is now under the command of the United States Army Installation Management Command. It is in Cochise County in southeast Arizona, ap ...
and
Davis–Monthan Air Force Base
Davis–Monthan Air Force Base (DM AFB) is a United States Air Force base southeast of downtown Tucson, Arizona. It was established in 1925 as Davis–Monthan Landing Field. The host unit for Davis–Monthan AFB is the 355th Wing (355 WG) assi ...
of the
U.S. Air Force.
The most major scientific site of Southern Arizona is the set of several
astronomical observatories
An observatory is a location used for observing terrestrial, marine, or celestial events. Astronomy, climatology/meteorology, geophysical, oceanography and volcanology are examples of disciplines for which observatories have been constructed. His ...
of the
Kitt Peak National Observatory
The Kitt Peak National Observatory (KPNO) is a United States astronomical observatory located on Kitt Peak of the Quinlan Mountains in the Arizona-Sonoran Desert on the Tohono Oʼodham Nation, west-southwest of Tucson, Arizona. With more than ...
, a reasonable distance west-southwest of Tucson.
Southern Arizona is the location of several large
national monuments protecting the scenery, wildlife, and
archaeological site
An archaeological site is a place (or group of physical sites) in which evidence of past activity is preserved (either prehistoric or historic or contemporary), and which has been, or may be, investigated using the discipline of archaeology an ...
s of Southern Arizona, and the
Saguaro National Park, which stands on two large sections of land, one west of the
Tucson metropolitan area and the other one east of Tucson.
The region includes several small mountain ranges including the
Chiricahua Mountains,
Huachuca Mountains,
Santa Ritas, the
Santa Catalinas, the
Rincons, the
Piñalenos, and others. As surprising as it might seem, some of these mountains are high enough, cold enough, and wet enough in the wintertime to provide
alpine skiing
Alpine skiing, or downhill skiing, is the pastime of sliding down snow-covered slopes on skis with fixed-heel bindings, unlike other types of skiing ( cross-country, Telemark, or ski jumping), which use skis with free-heel bindings. Whether ...
at regular ski resorts, with ski lifts, not very distant from cities such as Tucson.
Transportation
Significant distances requiring transportation in Southern Arizona are generally traveled by highway and the railroad. Southern Arizona is the location of the major transcontinental Interstate highway
Interstate 10
Interstate 10 (I-10) is the southernmost cross-country highway in the American Interstate Highway System. I-10 is the fourth-longest Interstate in the United States at , following I-90, I-80, and I-40. This freeway is part of the originally p ...
from the border with
New Mexico
)
, population_demonym = New Mexican ( es, Neomexicano, Neomejicano, Nuevo Mexicano)
, seat = Santa Fe, New Mexico, Santa Fe
, LargestCity = Albuquerque, New Mexico, Albuquerque
, LargestMetro = Albuquerque metropolitan area, Tiguex
, Offi ...
westward through Tucson, and then continuing northwest via Casa Grande to the Phoenix–Scottsdale–Mesa metropolis. Also, running westward from Casa Grande is
Interstate 8
Interstate 8 (I-8) is an Interstate Highway System, Interstate Highway in the southwestern United States. It runs from the southern edge of Mission Bay (San Diego), Mission Bay at Sunset Cliffs Boulevard in San Diego, San Diego, Californi ...
, which goes via Yuma into
California
California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
, crossing the Colorado River. Finally, the short
Interstate 19
Interstate 19 (I-19) is a north–south Interstate Highway located entirely within the US state of Arizona. I-19 travels from Nogales, roughly from the Mexican border, to Tucson, at I-10. The highway also travels through the cities of R ...
runs south from Tucson to Nogales, Arizona, and a major border crossing into Mexico. In addition, the much older Federal highway,
U.S. Route 80, crosses Southern Arizona from east to west from the New Mexico border, nearly to the California border, and formerly into California to the
Pacific Ocean
The Pacific Ocean is the largest and deepest of Earth's five oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, and is bounded by the conti ...
. However, its westernmost stretch has been replaced by Interstate 8, which was built on top of it and its right-of-way.
A
Transcontinental Railroad
A transcontinental railroad or transcontinental railway is contiguous railroad trackage, that crosses a continental land mass and has terminals at different oceans or continental borders. Such networks can be via the tracks of either a single ...
crosses Southern Arizona via Tucson and Phoenix. Also, there is a major railroad south from
Northern Arizona, via Phoenix, Casa Grande, and Tucson, to Nogales, where it crosses the border and meets the Mexican railroads.
The primary major airport of southern Arizona, Tucson International Airport, is located just south of Tucson.
History
Southern Arizona has been inhabited by human beings for several millennia. The
Hohokam
Hohokam () was a culture in the North American Southwest in what is now part of Arizona, United States, and Sonora, Mexico. It existed between 300 and 1500 AD, with cultural precursors possibly as early as 300 BC. Archaeologists disagree about ...
were the principal
Pre-Columbian
In the history of the Americas, the pre-Columbian era spans from the original settlement of North and South America in the Upper Paleolithic period through European colonization, which began with Christopher Columbus's voyage of 1492. Usually, ...
inhabitants of the area. In more recent times, the dominant indigenous group of
Native Americans have been the
O'odham tribe, which continues to reside in this area in their traditional homeland.
Several
Spanish
Spanish might refer to:
* Items from or related to Spain:
**Spaniards are a nation and ethnic group indigenous to Spain
**Spanish language, spoken in Spain and many Latin American countries
**Spanish cuisine
Other places
* Spanish, Ontario, Can ...
missions were established in the early 18th century by
Father Eusebio Francisco Kino in what was then known as the
Pimería Alta. After the
Mexican–American War
The Mexican–American War, also known in the United States as the Mexican War and in Mexico as the (''United States intervention in Mexico''), was an armed conflict between the United States and Mexico from 1846 to 1848. It followed the ...
of 1846–47, much of Southern Arizona was purchased by the United States from Mexico for $15,000,000 in the
Gadsden Purchase
The Gadsden Purchase ( es, region=MX, la Venta de La Mesilla "The Sale of La Mesilla") is a region of present-day southern Arizona and southwestern New Mexico that the United States acquired from Mexico by the Treaty of Mesilla, which took effe ...
of 1854.
More recently, Southern Arizona played an important role during the
Cold War
The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. The term '' cold war'' is used because t ...
. Davis-Monthan AFB was the home base of an
air force wing of 18 heavy
Titan II
The Titan II was an intercontinental ballistic missile (ICBM) developed by the Glenn L. Martin Company from the earlier Titan I missile. Titan II was originally designed and used as an ICBM, but was later adapted as a medium-lift space l ...
Intercontinental Ballistic Missile
An intercontinental ballistic missile (ICBM) is a ballistic missile with a range greater than , primarily designed for nuclear weapons delivery (delivering one or more thermonuclear warheads). Conventional, chemical, and biological weapo ...
s dispersed over a wide area of launch sites – south, southwest, and southeast of Tucson. About 20 years ago, due to their advancing age and the advent of several important
Strategic Nuclear Weapons Reduction treaties, all of these missiles were retired from service. All but one of their launch silos and command shelters were demolished with explosives. The remaining site, Titan II ICBM Site 571-7, about 15 miles south of Tucson on
Interstate 19
Interstate 19 (I-19) is a north–south Interstate Highway located entirely within the US state of Arizona. I-19 travels from Nogales, roughly from the Mexican border, to Tucson, at I-10. The highway also travels through the cities of R ...
, serves as the
Titan Missile Museum
The Titan Missile Museum, also known as Air Force Facility Missile Site 8 or as Titan II ICBM Site 571-7, is a former ICBM (intercontinental ballistic missile) site located about south of Tucson, Arizona in the United States. It was constructed ...
, a National Historic Landmark.
Secession
Beginning in 1987, a group of southern Arizonans have considered seceding from the rest of Arizona to form a new U.S. state, potentially named Baja Arizona or Gadsden. A political push to that effect began in February, 2011, led by a group of attorneys largely in opposition to what they perceived as a
nativist, conservative dominance in the Phoenix area in contrast to the
Democrats of the south. The organizers of this movement had aimed to hold a referendum vote on the matter in 2012 in
Pima County
Pima County ( ) is a county in the south central region of the U.S. state of Arizona. As of the 2020 census, the population was 1,043,433, making it Arizona's second-most populous county. The county seat is Tucson, where most of the populati ...
(and, possibly,
Santa Cruz County and
Cochise County
Cochise County () is a county in the southeastern corner of the U.S. state of Arizona. It is named after the Native American chief Cochise.
The population was 125,447 at the 2020 census. The county seat is Bisbee and the most populous city ...
).
, no ballot initiatives had been generated.
References
{{Coord, 33.40, -112.51, display=title
Geography of Arizona