page_title: Buenos Aires Province
section_title: History
hierarchical_section_title: Buenos Aires Province / History
caption_attribution_description: English: Portrait of Juan Manuel de Rosas, Governor of Buenos Aires Province.
context_page_description: Buenos Aires is the largest and most populous Argentine province. It takes its name from the city of Buenos Aires, the capital of the country, which used to be part of the province and the province's capital until it was federalized in 1880. Since then, in spite of bearing the same name, the province does not include Buenos Aires proper, though it does include all other parts of the Greater Buenos Aires metropolitan area. The capital of the province is the city of La Plata, founded in 1882.
  The province is the only one within all of Argentina to be divided into partidos and further into localidades. It borders the provinces of Entre Ríos to the northeast, Santa Fe to the north, Córdoba to the northwest, La Pampa to the west, Río Negro to the south and west and the Autonomous City of Buenos Aires to the northeast. Uruguay is just across the Rio de la Plata to the northeast, and both are on the coast of the Atlantic Ocean to the east. The entire province is part of the Pampas geographical region.
  The province has a population of about 15.6 million people, which is 39% of Argentina's total population. Nearly 10 million people live in Greater Buenos Aires.
context_section_description: The inhabitants of the province before the 16th-century advent of Spanish colonization were aboriginal peoples such as the Charrúas and the Querandíes. Their culture was lost over the next 350 years. They were subjected to Eurasian plagues from which few survived. The survivors joined other tribes or have been mostly absorbed by Argentina's European ethnic majority.
  Pedro de Mendoza founded Santa María del Buen Ayre in 1536. Even though the first contact with the aboriginals was peaceful, it soon became hostile. The city was evacuated in 1541. Juan de Garay re-founded the settlement in 1580 as Santísima Trinidad y Puerto Santa María de Los Buenos Aires.
  Amidst ongoing conflict with the aboriginals, the cattle farms extended from Buenos Aires, whose port was always the center of the economy of the territory. Following the creation of the Viceroyalty of the Río de la Plata at the end of the 18th century, the export of meat, leather and their derivatives through the port of Buenos Aires was the basis of the economic development of the region.
  Jesuits unsuccessfully tried to peacefully assimilate the aboriginals into the European culture brought by the Spanish conquistadores. A certain balance was found at the end of the 18th century when the Salado River became the limit between both civilizations, despite frequent malones (aboriginal attacks on border settlements). The end to this situation came in 1879 with the Conquest of the Desert (Conquista del Desierto) in which the aboriginals were almost completely exterminated.
  After the independence from Spain in 1816, the city and province of Buenos Aires became the focus of an intermittent Argentine Civil War with other provinces. A Federal Pact secured by Governor Juan Manuel de Rosas in 1831 led to the establishment of the Argentine Confederation and to his gaining the sum of public power, which provided a tenuous unity. Ongoing disputes regarding the influence of Buenos Aires, between Federalists and Unitarians, and over the Port of Buenos Aires (the prime source of public revenue at the time) fueled periodic hostilities. The province was declared independent on September 11, 1852, as the State of Buenos Aires. Concessions gained in 1859 Pact of San José de Flores and a victory at the Battle of Pavón led to its reincorporation into the Argentine Republic on December 17, 1861. Intermittent conflicts with the nation did not truly cease until 1880, when the city of Buenos Aires was formally federalized and, thus, administratively separated from the province.
  La Plata was founded in 1882 by Governor Dardo Rocha for the purpose of becoming the provincial capital. The equivalent of a billion (1880s) dollars of British investment and pro-development, education and immigration policies pursued at the national level subsequently spurred dramatic economic growth. Driven by European immigration and improved health, the province's population, like Argentina's, nearly doubled to one million by 1895 and doubled again by 1914. Rail lines connected nearly every town and hamlet in the province by 1914; many developed around the new railway stations.
  This era of accelerated development was cut short by the Wall Street Crash of 1929, which caused a sharp drop in commodity prices (99% of Argentine exports were agricultural) and led to a halt in the flow of investment funds between nations. The new Concordance and Perón governments funded ambitious lending and public works programs, visible in Buenos Aires Province through the panoply of levees, power plants, water works, paved roads, municipal buildings, and (particularly during Perón's 1946-55 tenure) schools, clinics and massive regional hospitals.
  The province's population, after 1930, began to grow disproportionately quickly in the suburban areas of Buenos Aires. These suburbs had grown to include 4 million out of the province's total 7 million people in 1960. Much of the area these new suburbs were developed on (particularly the poorer ones) consisted of wetlands and were prone to flooding. To address this, Governor Oscar Alende initiated 
caption: Governor Juan Manuel de Rosas (1841 oil portrait by Cayetano Descalzi) ruled until 1852 with an iron fist and kept the fragile Confederation under the tutelage of Buenos Aires Province.
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