/* History */
Europeans arrived in the region with the 1502 voyage of Amerigo Vespucci. Spanish navigator Juan Diaz de Solias visited what is now Argentina in 1516. Spain established a permanent colony on the site of Buenos Aires in 1580, although initial settlement was primarily overland from Peru. The Spanish further integrated Argentina into their empire by establishing the Vice Royalty of Rio de la Plata in 1776, and Buenos Aires became a flourishing port. Buenos Aires formally declared independence from Spain on July 9, 1816. Argentines revere Gen. Jose de San Martin--who campaigned in Argentina, Chile, and Peru--as the hero of their national independence. Following the defeat of the Spanish, centralist and federalist groups waged a lengthy conflict between themselves to determine the future of the nation. A modern constitution was promulgated in 1853, and a national unity government was established in 1861.
From 1880 to 1930, Argentina became one of the world's 10 wealthiest nations based on rapid expansion of agriculture and foreign investment in infrastructure. Conservative forces dominated Argentine politics until 1916, when their traditional rivals, the Radicals, won control of the government. The Radicals, with their emphasis on fair elections and democratic institutions, opened their doors to Argentina's rapidly expanding middle class as well as to groups previously excluded from power. The Argentine military forced aged Radical President Hipolito Yrigoyen from power in 1930 and ushered in another decade of Conservative rule. Using fraud and force when necessary, the governments of the 1930s attempted to contain the currents of economic and political change that eventually led to the ascendance of Juan Domingo Peron (b. 1897). New social and political forces were seeking political power, including a modern military and labor movements that emerged from the growing urban working class.
On March 11, 1973, Argentina held general elections for the first time in 10 years. Peron was prevented from running, but voters elected his stand-in, Dr. Hector Campora, as President. Peron's followers also commanded strong majorities in both houses of Congress. Campora resigned in July 1973, paving the way for new elections. Peron won a decisive victory and returned as President in October 1973 with his third wife, Maria Estela Isabel Martinez de Peron, as Vice President. During this period, extremists on the left and right carried out violent acts with a frequency that threatened public order. The government resorted to a number of emergency decrees, including the implementation of special executive authority to deal with violence. This allowed the government to imprison persons indefinitely without charge.