About 10,000 years ago, migrating Indians settled in fertile valleys and along the coast of what is now Chile. The Incas briefly extended their empire into what is now northern Chile, but the area's barrenness prevented extensive settlement. The first Europeans to arrive in Chile were Diego de Almagro and his band of Spanish conquistadors, who came from Peru seeking gold in 1535. The Spanish encountered hundreds of thousands of Indians from various cultures in the area that modern Chile now occupies. These cultures supported themselves principally through slash-and-burn agriculture and hunting. The conquest of Chile began in earnest in 1540 and was carried out by Pedro de Valdivia, one of Francisco Pizarro's lieutenants, who founded the city of Santiago on February 12, 1541. Although the Spanish did not find the extensive gold and silver they sought, they recognized the agricultural potential of Chile's central valley, and Chile became part of the Viceroyalty of Peru.

The drive for independence from Spain was precipitated by usurpation of the Spanish throne by Napoleon's brother Joseph in 1808. A national junta in the name of Ferdinand--heir to the deposed king--was formed on September 18, 1810. The junta proclaimed Chile an autonomous republic within the Spanish monarchy. A movement for total independence soon won a wide following. Spanish attempts to re-impose arbitrary rule during what was called the "Reconquista" led to a prolonged struggle.

Intermittent warfare continued until 1817, when an army led by Bernardo O'Higgins, Chile's most renowned patriot, and José San Martín, hero of Argentine independence, crossed the Andes into Chile and defeated the royalists. On February 12, 1818, Chile was proclaimed an independent republic under O'Higgins' leadership. The political revolt brought little social change, however, and 19th century Chilean society preserved the essence of the stratified colonial social structure, which was greatly influenced by family politics and the Roman Catholic Church. A strong presidency eventually emerged, but wealthy landowners remained extremely powerful. Toward the end of the 19th century, the government in Santiago consolidated its position in the south by ruthlessly suppressing the Mapuche Indians. In 1881, it signed a treaty with Argentina confirming Chilean sovereignty over the Strait of Magellan. As a result of the War of the Pacific with Peru and Bolivia (1879-83), Chile expanded its territory northward by almost one-third and acquired valuable nitrate deposits, the exploitation of which led to an era of national affluence. Chile established a parliamentary democracy in the late 19th century, but degenerated into a system protecting the interests of the ruling oligarchy. By the 1920s, the emerging middle and working classes were powerful enough to elect a reformist president, whose program was frustrated by a conservative congress. In the 1920s, Marxist groups with strong popular support arose.

Continuing political and economic instability resulted with the rule of the quasi-dictatorial Gen. Carlos Ibanez (1924-32). When constitutional rule was restored in 1932, a strong middle-class party, the Radicals, emerged. It became the key force in coalition governments for the next 20 years. During the period of Radical Party dominance (1932-52), the state increased its role in the economy.

The 1964 presidential election of Christian Democrat Eduardo Frei-Montalva by an absolute majority initiated a period of major reform. Under the slogan "Revolution in Liberty," the Frei administration embarked on far-reaching social and economic programs, particularly in education, housing, and agrarian reform, including rural unionization of agricultural workers. By 1967, however, Frei encountered increasing opposition from leftists, who charged that his reforms were inadequate, and from conservatives, who found them excessive. At the end of his term, Frei had accomplished many noteworthy objectives, but he had not fully achieved his party's ambitious goals. In 1970, Senator Salvador Allende, a Marxist and member of Chile's Socialist Party, who headed the "Popular Unity" (UP) coalition of socialists, communists, radicals, and dissident Christian Democrats, won a plurality of votes in a three-way contest and was named President by the Chilean Congress. His program included the nationalization of private industries and banks, massive land expropriation, and collectivization. Allende's program also included the nationalization of U.S. interests in Chile's major copper mines.

Elected with only 36% of the vote and by a plurality of only 36,000 votes, Allende never enjoyed majority support in the Chilean Congress or broad popular support. Domestic production declined; severe shortages of consumer goods, food, and manufactured products were widespread; and inflation reached 1,000% per annum. Mass demonstrations, recurring strikes, violence by both government supporters and opponents, and widespread rural unrest ensued in response to the general deterioration of the economy. By 1973, Chilean society had split into two hostile camps.

A military coup overthrew Allende on September 11, 1973. As the armed forces bombarded the presidential palace, Allende reportedly committed suicide. A military government, led by General Augusto Pinochet, took over control of the country. The first years of the regime in particular were marked by serious human rights violations. A new Constitution was approved by a plebiscite on September 11, 1980, and General Pinochet became President of the Republic for an 8-year term. In its later years, the regime gradually permitted greater freedom of assembly, speech, and association, to include trade union activity. In contrast to its authoritarian political rule, the military government pursued decidedly laissez-faire economic policies. During its 16 years in power, Chile moved away from economic statism toward a largely free market economy that fostered an increase in domestic and foreign private investment. In a plebiscite on October 5, 1988, General Pinochet was denied a second 8-year term as president. Chileans voted for elections to choose a new president and the majority of members of a two-chamber congress. On December 14, 1989, Christian Democrat Patricio Aylwin, the candidate of a coalition of 17 political parties called the Concertacion, was elected president. Aylwin served from 1990 to 1994 and was succeeded by another Christian Democrat, Eduardo Frei Ruiz-Tagle (son of the previous President), leading the same coalition, for a 6-year term. Ricardo Lagos Escobar of the Socialist Party and the Party for Democracy led the Concertacion to a narrower victory in 2000 presidential elections. His term ends in 2006.