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Acre () is a state located in the west of the North Region of
Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...
and the Amazonia Legal. Located in the westernmost part of the country, at a two-hour time difference from Brasília, Acre is bordered clockwise by the Brazilian states of Amazonas and Rondônia to the north and east, along with an international border with the
Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...
n department of Pando to the southeast, and the
Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...
vian regions of Madre de Dios, Ucayali and Loreto to the south and west. Its capital and largest city is Rio Branco. Other important places include Cruzeiro do Sul, Sena Madureira, Tarauacá and Feijó. The state, which has 0.42% of the Brazilian population, generates 0.2% of the Brazilian GDP. Intense extractive activity in the rubber industry, which reached its height in the early 20th century, attracted Brazilians from many regions to the state. From the mixture of sulista, southeastern Brazil, nordestino, and indigenous traditions arose a diverse cuisine. Fluvial transport, concentrated on the Juruá and Moa rivers, in the western part of the state, and the Tarauacá and Envira rivers in the northwest, is the principal form of transportation, especially between November and June. Heavy seasonal rains frequently make the BR-364 impassable in those months; it usually connects Rio Branco to Cruzeiro do Sul.


Etymology

The name, which was given to the territory in 1904, and to the state in 1962, is derived from one of the local rivers, perhaps originates from the Tupi word ''a'kir ü'' "green river", or from the form ''a'kir'', of the Tupi word ''ker'', "to sleep, to rest". It is believed more likely to be derived from ''Aquiri'', a transliteration by European explorers of the term ''Umákürü'', or ''Uakiry'', from the Ipurinã dialect. Another hypothesis is that Acquiri derives from ''Yasi'ri'', or ''Ysi'ri'', meaning "flowing or swift water". According to one account, agriculturist João Gabriel de Carvalho Melo wrote during an 1878 trip on the Purús River to merchant Viscount of Santo Elias (from Pará), asking him for goods to be sent to the "mouth of the Aquiri River". In Belém, the local merchant or his employees either misinterpreted Gabriel's handwriting, or he spelled the name wrong: the goods and invoice which Gabriel received were marked as having been sent to the Acre River. Acre possesses some nicknames: the End of Brazil, The Rubber Tree State, the Latex State (from when it was a center of rubber production) and the Western End. The native inhabitants of Acre are called ''acrianos'', in the singular ''acriano''. Until the entry according to the Orthographic Agreement of 1990, the correct spelling was ''acreano'' in the singular and in the plural ''acreanos''. In 2009, with the new orthographic agreement, the change generated controversy between the Academy of Letters of Acre (Academia Acreana de Letras) and the Brazilian Academy of Letters ( Academia Brasileira de Letras). The latter said that the change would mean the denial of the state's historical and cultural roots, by changing the last letter of the toponym from " E" to " I".


Geography

The state of Acre occupies an area of (58,911 mi2) in the extreme west of Brazil. It is located at 70º west longitude and at 9º south
latitude In geography, latitude is a geographic coordinate system, geographic coordinate that specifies the north-south position of a point on the surface of the Earth or another celestial body. Latitude is given as an angle that ranges from −90° at t ...
. In Brazil, the state is part of the North Region, forming borders with the states of Amazonas and Rondônia, and with two countries:
Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...
and
Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...
. Practically all of the terrain of the state of Acre is part of the low
sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...
plateau In geology and physical geography, a plateau (; ; : plateaus or plateaux), also called a high plain or a tableland, is an area of a highland consisting of flat terrain that is raised sharply above the surrounding area on at least one side. ...
, or terra firme, morphological unit which dominates most of the Brazilian
Amazon Amazon most often refers to: * Amazon River, in South America * Amazon rainforest, a rainforest covering most of the Amazon basin * Amazon (company), an American multinational technology company * Amazons, a tribe of female warriors in Greek myth ...
. These terranes rise, in Acre, from the southeast to the northeast, with very tabular
topography Topography is the study of the forms and features of land surfaces. The topography of an area may refer to the landforms and features themselves, or a description or depiction in maps. Topography is a field of geoscience and planetary sci ...
in general. In the extreme west is found the Serra da Contamana or Serra do Divisor, along the western
border Borders are generally defined as geography, geographical boundaries, imposed either by features such as oceans and terrain, or by polity, political entities such as governments, sovereign states, federated states, and other administrative divisio ...
, with the highest altitudes in the state (). About 63% of the state's surface lies between in height; 16% between 300 and 609 (984 and 1,998 ft); and 21% between 200 and 135 (656 and 443 ft). The
climate Climate is the long-term weather pattern in a region, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteoro ...
is hot and very humid, of the ''Am'' type in the
Köppen climate classification The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...
system, and the monthly average
temperatures Temperature is a physical quantity that quantitatively expresses the attribute of hotness or coldness. Temperature is measured with a thermometer. It reflects the average kinetic energy of the vibrating and colliding atoms making up a subst ...
vary between , being the lowest average of the North Region. The rainfall reaches an annual total of , with a clear dry season in the months of June, July, and August. The
Amazon Rainforest The Amazon rainforest, also called the Amazon jungle or Amazonia, is a Tropical and subtropical moist broadleaf forests, moist broadleaf tropical rainforest in the Amazon biome that covers most of the Amazon basin of South America. This basin ...
covers all of the state territory. Very rich in rubber trees of the most valuable species (''Hevea brasiliensis'') and Brazil nut trees (''Bertholletia excelsa''), the forest guarantees that Acre is the greatest national producer of
rubber Rubber, also called India rubber, latex, Amazonian rubber, ''caucho'', or ''caoutchouc'', as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds. Types of polyisoprene ...
and nuts. Acre's principal rivers, mostly navigable during the wet season (the Juruá, Tarauacá, Envira, Purús, Iaco, and
Acre The acre ( ) is a Unit of measurement, unit of land area used in the Imperial units, British imperial and the United States customary units#Area, United States customary systems. It is traditionally defined as the area of one Chain (unit), ch ...
), cross the state with almost parallel courses which converge only outside of its territory. The largest recorded Black Caiman, measured at and weighing , was shot in Acre in 1965. The Amazon represents over half of the planet's remaining
rainforest Rainforests are forests characterized by a closed and continuous tree Canopy (biology), canopy, moisture-dependent vegetation, the presence of epiphytes and lianas and the absence of wildfire. Rainforests can be generally classified as tropi ...
s and comprises the largest and most species-rich tract of tropical rainforest in the world. Wet tropical forests are the most species-rich
biome A biome () is a distinct geographical region with specific climate, vegetation, and animal life. It consists of a biological community that has formed in response to its physical environment and regional climate. In 1935, Tansley added the ...
, and tropical forests in the Americas are consistently more species-rich than the wet forests in Africa and Asia.Turner, I.M. 2001. ''The ecology of trees in the tropical rain forest''.
Cambridge University Press Cambridge University Press was the university press of the University of Cambridge. Granted a letters patent by King Henry VIII in 1534, it was the oldest university press in the world. Cambridge University Press merged with Cambridge Assessme ...
, Cambridge.
As the largest tract of tropical rainforest in the Americas, the Amazonian rainforests have unparalleled
biodiversity Biodiversity is the variability of life, life on Earth. It can be measured on various levels. There is for example genetic variability, species diversity, ecosystem diversity and Phylogenetics, phylogenetic diversity. Diversity is not distribut ...
. More than 1/3 of all species in the world live in the Amazon Rainforest.


Statistical and legal subdivisions

Acre is divided into 22 municipalities, 5 immediate regions and 2 intermediate regions:


Rio Branco

* Immediate Region of Brasileia **: * Immediate Region of Rio Branco **: * Microregion of Sena Madureira **:


Cruzeiro do Sul

* Immediate Region of Cruzeiro do Sul **: * Immediate Region of Tarauacá **:


History

The region of present-day Acre is thought to have been inhabited by
Pre-Columbian In the history of the Americas, the pre-Columbian era, also known as the pre-contact era, or as the pre-Cabraline era specifically in Brazil, spans from the initial peopling of the Americas in the Upper Paleolithic to the onset of European col ...
civilizations since at least 2,100 years ago. Evidence includes complex geoglyphs of this age found in the area. The natives who crafted them are believed to have had a relatively advanced knowledge of this technology. Since at least the early 15th century, the region has been inhabited by peoples who spoke Panoan languages; their territory was geographically close to that of the
Inca The Inca Empire, officially known as the Realm of the Four Parts (, ), was the largest empire in pre-Columbian America. The administrative, political, and military center of the empire was in the city of Cusco. The History of the Incas, Inca ...
. In the mid-18th century, the region was colonized by the Spanish and became part of the
Viceroyalty of Peru The Viceroyalty of Peru (), officially known as the Kingdom of Peru (), was a Monarchy of Spain, Spanish imperial provincial administrative district, created in 1542, that originally contained modern-day Peru and most of the Spanish Empire in ...
. Following the Peruvian and Bolivian wars of independence, which ended in 1826, the region and large portions around it became part of both Peru and Bolivia respectively, but independent of Spain and both states disputed the territory. It was a territory of the short-lived Peru–Bolivian Confederation (1836–1839), until the two countries separated and most of the region returned to Bolivian control. The discovery of rubber tree groves in the region in the mid-19th century attracted numerous immigrants, especially from Brazil and Europe, seeking to build on the rubber boom. Despite the increased numbers of Brazilians, the Treaty of Ayacucho (1867) determined that the region belonged to Bolivia. By 1877, Acre's population was composed almost entirely of Brazilians coming from the Northeast. In 1899, Brazilian settlers from Acre created an independent state in the region called the Republic of Acre. Bolivians tried to gain control of the area, but Brazilians revolted and there were border confrontations. This resulted in what was known as the Acre War. On November 17, 1903, with the signing over and sale in the Treaty of Petrópolis, Brazil received final possession of the region. Acre was integrated into Brazil as a territory divided into three departments. The territory was acquired by Brazil for two million pounds sterling. The land was taken from
Mato Grosso Mato Grosso ( – ) is one of the states of Brazil, the List of Brazilian states by area, third largest by area, located in the Central-West Region, Brazil, Central-West region. The state has 1.66% of the Brazilian population and is responsible ...
in accordance with terms for the construction of the Madeira-Mamoré railway. Once the Acre War was over, Peru did not recognize the annexation of Acre until 1909, with the Velarde-Río Branco Treaty, where the borders between Peru and Brazil were defined. It was signed in
Rio de Janeiro Rio de Janeiro, or simply Rio, is the capital of the Rio de Janeiro (state), state of Rio de Janeiro. It is the List of cities in Brazil by population, second-most-populous city in Brazil (after São Paulo) and the Largest cities in the America ...
, on September 8, 1909, by the Minister of Foreign Affairs of Brazil, Baron of Rio Branco, and the plenipotentiary minister of Peru in Brazil, Hernán Velarde, by President Augusto B. Leguía (first government) then ruled in Peru, and in Brazil by the president Nilo Pecanha, in order to solve the border problems between Peru and Brazil. Acre was united in 1920. On June 15, 1962, it was elevated to the category of state, and was the first to be governed by a woman, Iolanda Fleming, a teacher. During the early twentieth century, rubber seedlings were taken to Southeast Asia, where competitive plantations were established, reducing the importance of the Amazon in production. But during the
Second World War World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
, Japanese forces took over the rubber tree groves of Malaya. Acre was called on to produce rubber for the Allied war effort. The Rubber Soldiers, natives mostly of the Ceará plantation, increased production and provided critical supplies to the Allies. Acre's decisive contribution to the Allied victory may have helped Brazil attract North American investment to form the National Steel Company (Companhia Siderúrgica Nacional) in the postwar era. This company aided in the industrialization of the Central-south, which did not yet possess basic heavy industries. On April 4, 2008, Acre won a judicial debate with the state of Amazonas in relation to the dispute surrounding the Cunha Gomes Line. It annexed part of the municipalities of Envira, Guajará, Boca do Acre, Pauini, Eirunepé and Ipixuna. The territorial redefinition consolidated the incorporation of 1.2 million hectares of the Liberdade, Gregório, and Mogno forest complex to the territory of Acre, which corresponds to .


Initial settlement

Since the 1970s, numerous geoglyphs, major geometric earthworks, have been discovered on deforested land in Acre, and dated to between 1–1250 AD. These are cited as evidence of complex
Pre-Columbian In the history of the Americas, the pre-Columbian era, also known as the pre-contact era, or as the pre-Cabraline era specifically in Brazil, spans from the initial peopling of the Americas in the Upper Paleolithic to the onset of European col ...
societies. The
BBC The British Broadcasting Corporation (BBC) is a British public service broadcaster headquartered at Broadcasting House in London, England. Originally established in 1922 as the British Broadcasting Company, it evolved into its current sta ...
's '' Unnatural Histories'' explored studies of this area, concluding that the
Amazon rainforest The Amazon rainforest, also called the Amazon jungle or Amazonia, is a Tropical and subtropical moist broadleaf forests, moist broadleaf tropical rainforest in the Amazon biome that covers most of the Amazon basin of South America. This basin ...
, rather than being a pristine "
wilderness Wilderness or wildlands (usually in the plurale tantum, plural) are Earth, Earth's natural environments that have not been significantly modified by human impact on the environment, human activity, or any urbanization, nonurbanized land not u ...
", has been shaped by man for at least 11,000 years. Traditional ancient practices included forest gardening. Ondemar Dias is credited as the first to discover the geoglyphs in 1977. Alceu Ranzi expanded their findings by flying over Acre. During the 17th century, Portuguese expeditions reached many of the far ends of present-day Brazil. The expansion of the exploration to the west followed, and they reached lands under control by the Spanish colonies. The two nations negotiated to establish their territories, under the Treaties of
Madrid Madrid ( ; ) is the capital and List of largest cities in Spain, most populous municipality of Spain. It has almost 3.5 million inhabitants and a Madrid metropolitan area, metropolitan area population of approximately 7 million. It i ...
(1750) and San Ildefonso (1777). Both of the treaties were based on the explorations of Portuguese ''bandeirante'' Manoel Félix de Lima of the Guaporé and
Madeira Madeira ( ; ), officially the Autonomous Region of Madeira (), is an autonomous Regions of Portugal, autonomous region of Portugal. It is an archipelago situated in the North Atlantic Ocean, in the region of Macaronesia, just under north of ...
river basins. The treaties established the riverbeds of the Mamoré and Guaporé to their maximum western limits on the left bank of the Javari as the border between the Spanish and Portuguese territories. The Portuguese created the new royal captaincy of Mato Grosso (1751), stimulating settlement toward the frontier. New centers developed: Vila Bela (1752) on the banks of the Guaporé, Vila Maria (1778) on the Paraguay River, and Casalvasco (1783). Until the mid-19th century, there was little effort to settle the area systematically. At that time, the great virgin source of rubber attracted commercial interest, and development followed. The empire was directed towards agricultural exports, based on coffee as the most important commodity. The territories of the extreme west were unknown and usually overlooked. For example, although Cândido Mendes de Almeida's ''Atlas of the Empire of Brazil'' (1868), was considered a model of its time, geographers knew nothing of the Acre River and its principal tributaries, which did not appear at all in the atlas. Some few armed bands of Brazilian explorers exploited the rural and unpopulated region, not knowing and little interested in whether they were "controlled" by Brazil,
Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...
, or
Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...
. But the rubber boom of the mid-19th century, stimulated exploration by various expeditions to survey this resource and develop a plan for colonial settlement. At that time, João Rodrigues Cametá initiated the conquest of the Purús River;SILVA, Hiram Reis and (July 7, 2009
"João Rodrigues Cametá"
Manuel Urbano da Encarnação, an Indian with extensive knowledge of the region, reached the Acre River, traveling up it as far as the vicinity of the Xapuri; and João da Cunha Correia reached the
drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, ...
of the upper Tarauacá. For the most part, these expeditions took place on
Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...
n land. Exploitative activities, the industrial importance of the rubber reserves, and the penetration of Brazilian colonists in the region raised the attention of
Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...
, which solicited a better fixation of boundaries. After much failed negotiation, in 1867 the Treaty of Ayacucho was signed, which recognized the colonial '' uti possidetis'', or use of that territory by Brazil. A border was established parallel to the confluence of the Beni and Mamoré rivers, running eastward to the headwaters of the Javari River, even though the source of this river was not yet known.


Northeast occupation

As the price of rubber rose in the market, the demand for it grew. The race to the
Amazon Amazon most often refers to: * Amazon River, in South America * Amazon rainforest, a rainforest covering most of the Amazon basin * Amazon (company), an American multinational technology company * Amazons, a tribe of female warriors in Greek myth ...
increased.
Plantation Plantations are farms specializing in cash crops, usually mainly planting a single crop, with perhaps ancillary areas for vegetables for eating and so on. Plantations, centered on a plantation house, grow crops including cotton, cannabis, tob ...
s multiplied in the valleys of the Acre, Purús and, farther west, the Tarauacá. In the year 1873–1874, in the
drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, ...
of the Purús, the population rose from around one thousand to four thousand inhabitants. The Brazilian imperial government, already sensitive to the resulting offerings of
rubber Rubber, also called India rubber, latex, Amazonian rubber, ''caucho'', or ''caoutchouc'', as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds. Types of polyisoprene ...
, considered the entire valley of the Purús to be Brazilian. In the second half of the 19th century, disturbances were registered in the demographic and geo-economic balance of the empire. The coffee boom in the south attracted financial resources and workers, to detriment of the northeast.FURTADO, Celso. . Marcilio.com. Page visited on October 6, 2010 The growing impoverishment of that region stimulated migratory waves to the states of
Rio de Janeiro Rio de Janeiro, or simply Rio, is the capital of the Rio de Janeiro (state), state of Rio de Janeiro. It is the List of cities in Brazil by population, second-most-populous city in Brazil (after São Paulo) and the Largest cities in the America ...
,
Minas Gerais Minas Gerais () is one of the 27 federative units of Brazil, being the fourth largest state by area and the second largest in number of inhabitants with a population of 20,539,989 according to the 2022 Brazilian census, 2022 census. Located in ...
, and
São Paulo São Paulo (; ; Portuguese for 'Paul the Apostle, Saint Paul') is the capital of the São Paulo (state), state of São Paulo, as well as the List of cities in Brazil by population, most populous city in Brazil, the List of largest cities in the ...
. The movement of population became particularly active during the prolonged drought of the northeastern interior, from 1877 to 1880. Hundreds of Ceará indigenous people headed for the rubber plantations in search of work.TOSCANO, Fernando
"Estados Brasileiros: Acre"
Portal Brasil. Page visited October 6, 2010
The Cearense migration reached the banks of the Juruá and accelerated the occupation of land which
Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...
would later reclaim. The great fluvial rivers and their
tributary A tributary, or an ''affluent'', is a stream or river that flows into a larger stream (''main stem'' or ''"parent"''), river, or a lake. A tributary does not flow directly into a sea or ocean. Tributaries, and the main stem river into which they ...
systems were full of small ship fleets transporting colonists, goods, and supply material to the most isolated centers. The governments of Amazonas and
Pará Pará () is a Federative units of Brazil, state of Brazil, located in northern Brazil and traversed by the lower Amazon River. It borders the Brazilian states of Amapá, Maranhão, Tocantins (state), Tocantins, Mato Grosso, Amazonas (Brazilian st ...
quickly established ''supply houses'', which financed various types of operations, guaranteed credit, and promoted the commercial incentive of the rubber tree groves. The
rubber Rubber, also called India rubber, latex, Amazonian rubber, ''caucho'', or ''caoutchouc'', as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds. Types of polyisoprene ...
race had the frantic urgency of
gold rush A gold rush or gold fever is a discovery of gold—sometimes accompanied by other precious metals and rare-earth minerals—that brings an onrush of miners seeking their fortune. Major gold rushes took place in the 19th century in Australia, ...
es of the 18th century.GURGEL, Rodrigo
"Revolução Acreana: Bolívia e Brasil disputam o Acre"
UOL Education. Page visited on October 6, 2010.
The situation drew the attention of the government to the economic use and development of an almost completely unknown area. The activities of private businesses would enable the government to incorporate the new region.


Land dispute

In 1890, José Manuel Pando, a Bolivian official, alerted his government to the fact that more than three hundred rubber plantations had been developed in the Jura basin, and most were occupied by
Brazilians Brazilians (, ) are the citizens of Brazil. A Brazilian can also be a person born abroad to a Brazilian parent or legal guardian as well as a person who acquired Brazilian nationality law, Brazilian citizenship. Brazil is a multiethnic society, ...
on what was nominally
Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...
n territory. The Brazilian penetration had advanced west from the 64th meridian to beyond the 72nd, in an extension of one thousand kilometers, despite the borders having been established. The Treaty of 1867 limited Brazil to land above the confluence of the Beni and Mamoré rivers. In 1895 a new commission to define the borders was created. The Brazilian representative, Gregório Taumaturgo de Azevedo, resigned after verifying that the ratification of the Treaty of 1867 would harm the Brazilian rubber gatherers already settled in Bolivian territory. In 1899, the Bolivians established an administrative post in Puerto Alonso, exacting taxes and customs duties upon Brazilian activities."História de Porto Acre
IBGE Library. Page visited on October 9, 2010.
The following year, Brazil accepted the sovereignty of
Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...
in the zone, when it officially recognized the old boundaries at the confluence of the Beni and Mamoré rivers. Distant from the diplomatic process, the rubber workers judged their interests to have been cheated, and initiated insurrection movements. Some of this was in response to brutal treatment and abuse by forces managed by the major rubber companies. In the same year that Bolivia established administration in Puerto Alonso (1899), two serious uprisings occurred. In April, a Cearense lawyer, José Carvalho, led an armed movement, which culminated in the expulsion of the Bolivian authorities. Shortly thereafter, Bolivia began negotiations with an Anglo-American trust, the ''Bolivian Syndicate'', in order to promote, with exceptional force (exacting of taxes, armed force), the political and economic incorporation of Acre into its territory. The governor of Amazonas, Ramalho Júnior, informed of the agreement by a functionary of the Bolivian consulate in Belém, Luis Gálvez Rodríguez de Arias, sent military contingents forward to occupy Puerto Alonso. Gálvez proclaimed the independence of Acre, in the form of a republic. He became its president with the acquiescence of the rubber gatherers. Under protests from Bolivia, President Campos Sales abolished the ephemeral republic (March 1900). Bolivians, reinstated in the region, suffered in 1900 from the assault of the so-called Floriano Peixoto expedition, or "expedition of the poets".SCILLING, Voltaire
"A Expedição dos Poetas"
Earth Education:History. Page visited on October 9, 2010.
It was made up of intellectual bohemians from Manaus. Following brief fighting in the area surrounding Puerto Alonso, the expedition was completely scattered. Ultimately, the Bolivian government signed a contract with the ''Bolivian Syndicate'' (July 1901). The Brazilian congress, shocked by the arbitrariness of the act, took measures, canceling commercial accords and navigation between the two countries, and suspending the right of travel to Bolivia. At the same time, Brazilians organized a large armed assault on the disputed area. The operations were led by a former student of the Military School of Rio Grande do Sul ( Escola Militar do Rio Grande do Sul),
José Plácido de Castro José Plácido de Castro (9 September 1873 – 11 August 1908) was a Brazilian soldier, surveyor, rubber producer and politician who led the armed revolt during the Acre War of 1902–3, when the Republic of Acre broke away from Bolivia. He was t ...
. The rubber gatherers occupied the village of Xapuri in Alto Acre (August 1902), and took Bolivian officials into custody. Finally, Plácido de Castro's forces besieged Puerto Alonso, proclaiming the Independent State of Acre, after the capitulation of Bolivian troops (February 1903).


Diplomatic intervention

José Plácido de Castro José Plácido de Castro (9 September 1873 – 11 August 1908) was a Brazilian soldier, surveyor, rubber producer and politician who led the armed revolt during the Acre War of 1902–3, when the Republic of Acre broke away from Bolivia. He was t ...
was proclaimed governor of the new Independent State of Acre, and he had to discuss the question of borders in the diplomatic sphere. The Baron of Rio Branco, who had just assumed the role of Brazil's Minister of External Relations, immediately opened channels which were meant to have put an end to the question. The simplest problem, with the ''Bolivian Syndicate'', was resolved by Brazil paying one hundred and ten thousand pounds to renounce the contract (February 1903). Next, commercial relations were reestablished with Bolivia, while a part of the territory on the upper Purús and Juruá, militarily occupied in March 1903, was declared litigious. Bolivia finally agreed to cede to Brazil an area of , in exchange for two million pounds sterling, paid in two installments. Brazil committed to the construction of a Madeira-Mamoré Railway, connecting Porto Velho to Guajará-Mirim, at the confluence of the Beni and Madeira rivers. These actions were ratified in the Treaty of Petrópolis (November 17, 1903), through which Brazil acquired the future territory, now state of Acre.
Peru Peru, officially the Republic of Peru, is a country in western South America. It is bordered in the north by Ecuador and Colombia, in the east by Brazil, in the southeast by Bolivia, in the south by Chile, and in the south and west by the Pac ...
had also claimed sovereignty over the entire territory of Acre and part of the state of Amazonas, based on historic colonial titles. After armed conflicts between
Brazilians Brazilians (, ) are the citizens of Brazil. A Brazilian can also be a person born abroad to a Brazilian parent or legal guardian as well as a person who acquired Brazilian nationality law, Brazilian citizenship. Brazil is a multiethnic society, ...
and Peruvians on the upper Purús and Juruá, a joint administration was established in those regions (1904). The studies to determine the borders proceeded until the end of 1909, when a treaty was signed that completed the political integration of Acre into Brazilian territory.


Development from territory to statehood

Exercising a prominent role in national exports until 1913, when rubber was introduced to European and North American markets, Acre enjoyed a period of great prosperity. At the start of the 20th century, in a period of less than ten years, it grew to have more than 50,000 inhabitants. From 1946 on, the federal government undertook actions to revive the economy of the
Amazon Basin The Amazon basin is the part of South America drained by the Amazon River and its tributary, tributaries. The Amazon drainage basin covers an area of about , or about 35.5 percent of the South American continent. It is located in the countries ...
, and to include it in regional development projects. Attending to the judicial arrangements of the Treaty of Petrópolis, President Rodrigues Alves sanctioned the law which created the Territory of Acre (1904), further dividing it into three departments: Alto Acre, Alto Purús, and Alto Juruá, the latter being separated to form Alto Tarauacá (1912). The departmental administration was exercised until 1921 by mayors appointed by the President of Brazil. At that time the arrangements were altered, passing the administration to a governor. The second Constitution of Brazil (1934) conceded to Acre the right to elect representatives to the National Congress of Brazil. During the Estado Novo (New State) political ideas involving the valorization of the interior took hold, with the intention of promoting the articulation of more isolated areas. Thereafter, the vote of 1946 commended the channeling of budgetary resources from the Union to the
Amazon Amazon most often refers to: * Amazon River, in South America * Amazon rainforest, a rainforest covering most of the Amazon basin * Amazon (company), an American multinational technology company * Amazons, a tribe of female warriors in Greek myth ...
, determining that the Territory of Acre would be elevated to the condition of state as soon as its revenue reached the equivalent of the lowest state tax exaction. In the 1960s, the second cycle of efforts to accelerate the progress of the Amazon area was begun with the Superintendency of the Development of the Amazon ( Superintendência do Desenvolvimento da Amazônia or SUDAM, 1966). Better networking of regional sub-sectors within the state was sought out, thus connecting the branch lines of the Transamazônica, which connected Rio Branco and Brasiléia, on the upper course of the Acre River, and Cruzeiro do Sul, on the banks of the Juruá, crossing the valleys of the Purús and the Tarauacá. Planning politics developed, therefore, destined to correct the demographic, economic, and political distortions of national integration.


Demographics

According to the IBGE of 2022, there were 830,018 people residing in the state. making Acre the third least populated state. The population density was 4.5 inh./km2.
Urbanization Urbanization (or urbanisation in British English) is the population shift from Rural area, rural to urban areas, the corresponding decrease in the proportion of people living in rural areas, and the ways in which societies adapt to this change. ...
: 69.6% (2006);
Population growth Population growth is the increase in the number of people in a population or dispersed group. The World population, global population has grown from 1 billion in 1800 to 8.2 billion in 2025. Actual global human population growth amounts to aroun ...
: 3.3% (1991–2000);
House A house is a single-unit residential building. It may range in complexity from a rudimentary hut to a complex structure of wood, masonry, concrete or other material, outfitted with plumbing, electrical, and heating, ventilation, and air c ...
s: 162,000 (2006). The last Census in 2022 revealed the following numbers: 549,889 Brown ( Multiracial) people (66.3%), 177,992
White White is the lightest color and is achromatic (having no chroma). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully (or almost fully) reflect and scatter all the visible wa ...
(21.4%), 71,086
Black Black is a color that results from the absence or complete absorption of visible light. It is an achromatic color, without chroma, like white and grey. It is often used symbolically or figuratively to represent darkness.Eva Heller, ''P ...
(8.6%), 29,163 Amerindian people (3.5%). Image:Nova_Ceará_(4138555642).jpg, Rio Branco in the afternoon Image:Xapuri_-_Acre_(3800573425).jpg,
Saint Sebastian Sebastian (; ) was an early Christianity, Christian saint and martyr. According to traditional belief, he was killed during the Diocletianic Persecution of Christians. He was initially tied to a post or tree and shot with arrows, though this d ...
Festivities in Xapuri Image:Cruzeiro_do_Sul_-_Acre_(3800390087).jpg, A seller of the nationally renowned and appreciated Cruzeiro do Sul
cassava ''Manihot esculenta'', common name, commonly called cassava, manioc, or yuca (among numerous regional names), is a woody shrub of the spurge family, Euphorbiaceae, native to South America, from Brazil, Paraguay and parts of the Andes. Although ...
flour Flour is a powder made by Mill (grinding), grinding raw grains, List of root vegetables, roots, beans, Nut (fruit), nuts, or seeds. Flours are used to make many different foods. Cereal flour, particularly wheat flour, is the main ingredie ...
Image:FeijoAC2.jpg, Beach & Açaí Festival of Feijó, Acre Image:Rodeio Expoacre2.jpg, Opening ceremony of the ExpoAcre Field Day


Largest cities


Education

Portuguese is the official national language, and thus the primary language taught in schools. English and Spanish are also part of the official high school curriculum.


Educational institutions

* Universidade Federal do Acre (Ufac) (Federal University of Acre); * Faculdade da Amazônia Ocidental (Faao) (College of Western Amazon); * Faculdade de Ciências Jurídicas e Sociais Applicadas Rio Branco (Firb); * Instituto de Educação, Ciência e Tecnologia do Vale do Juruá (Ieval); * Instituto de Ensino Superior do Acre (Iesacre); * União Educacional do Norte (Uninorte).


Economy

The service sector is the largest component of GDP at 66%, followed by the
industrial sector In macroeconomics, the secondary sector of the economy is an economic sector in the three-sector theory that describes the role of manufacturing. It encompasses industries that produce a finished, usable product or are involved in construc ...
at 28.1%.
Agriculture Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created ...
represents 5.9%, of GDP (2004). Acre exports: wood 85.6%, poultry (chicken and wild turkey) 4.7%, wood products 1.7% (2002). Share of the Brazilian economy: 0.2% (2005).


Infrastructure


Airports

* Rio Branco Rio Branco International Airport is located in a rural zone of the municipality of Rio Branco, in the state of Acre. It was opened on November 2, 1999, with a unique characteristic: it moved 22 kilometers away from the previous airport site. Rio Branco Airport serves domestic and international flights (by scheduled carriers and air taxi firms) along with general and military aviation. The terminal can receive 270 thousand passengers a year and serves an average of 14 daily operations. * Cruzeiro do Sul Cruzeiro do Sul International Airport is located 18 kilometers away from the city center, which helps access to the Alto Juruá region. It was opened on October 28, 1970, and absorbed by
Infraero Empresa Brasileira de Infraestrutura Aeroportuária (abr. Infraero) is a Brazilian government corporation founded in 1973, authorized by Law 5,862, that is responsible for operating the main List of the busiest airports in Brazil, Brazilian com ...
on March 31, 1980. The airport infrastructure was built in 1976 by the municipal government. In 1994, the runway was completely renovated. There are domestic airports at Tarauacá, Sena Madureira and Brasiléia.


Highways

* BR-364 (Rio Branco to Southeastern Brazil); * BR-317 (Rio Branco to south of Acre); * AC-040 (Rio Branco to Plácido de Castro); * AC-401 (Plácido de Castro to Acrelândia); * AC-010 (Rio Branco to Porto Acre). Two roads to Peru: * at Boqueirão * BR-317 from Assis Brasil to Highway 30C to Iñapari and Highway 26 to Cuzco. Three roads to Bolivia: * from Rio Branco at Plácido de Castro, * from Rio Branco to Santa Rosa, * from BR-317 in Brasileia to Ruta 13 in Cobija. Three roads (interstates) to Amazonas: * Rio BrancoBoca do Acre * FeijóEnvira * Cruzeiro do SulGuajará One road to Southeastern Brazil: * BR-364


Sports

Rio Branco provides visitors and residents with various sport activities.


Stadiums

* Arena da Floresta stadium; * José de Melo stadium; * Federação Acreana de Futebol stadium; * Dom Giocondo Maria Grotti stadium; * Adauto de Brito stadium; * and many others. The Arena da Floresta stadium in Rio Branco was one of the 18 candidates to host games in the
2014 FIFA World Cup The 2014 FIFA World Cup was the 20th FIFA World Cup, the quadrennial world championship for list of men's national association football teams, men's national Association football, football teams organised by FIFA. It took place in Brazil fr ...
, which was held in Brazil, but did not make it to the final 12 chosen.


Culture

Despite being the only state that fought to be Brazilian ( Acre War), Acre's culture is similar to that of other Northern Brazilian states, however, there is a high consumption of Northeastern Brazilian culture. In Rio Branco, there is a religious community called Alto Santo (Universal Christian Enlightenment Center) that practices the Santo Daime Ritual, typical of Acre, of indigenous origin, which uses Daime, a natural tea made with leaves and vines, used by the Indigenous peoples as a way of approaching God. The ritual implies in drinking a tea, including children and the elderly. The members wear uniforms and sing the hymnal. The best-known dish consumed by Acreans is called Baixaria. The typical food uses duck, tucupi, cassava flour and pirarucu fish, in addition to the huge variety of Amazonian fruits inherited from the
Indigenous peoples There is no generally accepted definition of Indigenous peoples, although in the 21st century the focus has been on self-identification, cultural difference from other groups in a state, a special relationship with their traditional territ ...
. Some singers, activists and artists from Acre: João Donato, Sansão Campos Pereira, Chico Mendes, Sergio Souto and Tião Natureza.


Flag

The flag was adopted on March 15, 1921. It is a variation of the flags used by the secessionist state of Acre, with the yellow and green parts exchanged and mirrored. The yellow color symbolizes peace, green hope, and the star symbolizes the light which guided those who worked to make Acre a state of Brazil.


See also

* Acre conspiracy * Amazon rubber cycle * List of rivers of Acre *
List of municipalities in Acre Acre is a state located in the west of the North Region, Brazil, North Region of Brazil. According to the 2022 Brazilian census, it is the Federative units of Brazil, third least populous state with a population of 830,018 and the twelfth smalles ...
* List of governors of Acre


References


External links

* {{Authority control Federative units of Brazil * 1962 establishments in Brazil States and territories established in 1962 Former Spanish colonies