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South America was home to sophisticated civilizations for thousands of years before European contact, most famously the Inca Empire, which by the early 1500s stretched along the Andes from present-day Colombia to Chile and Argentina — the largest empire in the pre-Columbian Americas, administered through an extensive road network still partially in use today. Earlier cultures, including the Norte Chico civilization in Peru (among the oldest known in the Americas) and the Tiwanaku civilization near Lake Titicaca, laid groundwork the Inca later built on.
Spanish and Portuguese colonization from the early 1500s reshaped the continent within a few generations — the 1494 Treaty of Tordesillas had already divided South America between the two powers before either had fully explored it, which is why Brazil is Portuguese-speaking while the rest of the continent is predominantly Spanish-speaking today. Colonization brought devastating population loss among indigenous peoples through disease and conquest, alongside the transatlantic slave trade, which forcibly brought millions of Africans to the continent, particularly to Brazil.
Independence movements swept the continent in the early 1800s, led by figures still celebrated across the region today — Simón Bolívar in the north (present-day Venezuela, Colombia, Ecuador, Bolivia, Peru) and José de San Martín in the south (Argentina, Chile, Peru) — with most countries achieving independence from Spain or Portugal between 1810 and 1825.
The 20th century brought a turbulent mix of economic growth, political instability, and periods of military rule across much of the continent, followed by a broad return to democratic government from the 1980s onward. Today South America's countries range from some of the world's largest economies (Brazil) to some still recovering from severe economic and political crises (Venezuela), a diversity that shapes both the travel experience and the responsible-travel considerations of visiting the region.