Brazil covers nearly half of South America and is the continents largest nation. It extends 2,965 mi (4,772 km) north-south, 2,691 mi (4,331 km) east-west, and borders every nation on the continent except Chile and Ecuador. Brazil may be divided into the Brazilian Highlands, or plateau, in the south and the Amazon River Basin in the north. Over a third of Brazil is drained by the Amazon and its more than 200 tributaries. The Amazon is navigable for ocean steamers to Iquitos, Peru, 2,300 mi (3,700 km) upstream. Southern Brazil is drained by the Plata system—the Paraguay, Uruguay, and Paraná rivers.
Brazil is the only Latin American nation that derives its language and culture from Portugal. The native inhabitants mostly consisted of the nomadic Tupí-Guaraní Indians. Adm. Pedro Alvares Cabral claimed the territory for Portugal in 1500. The early explorers brought back a wood that produced a red dye, pau-brasil, from which the land received its name. Portugal began colonization in 1532 and made the area a royal colony in 1549.
During the Napoleonic Wars, King João VI, fearing the advancing French armies, fled Portugal in 1808 and set up his court in Rio de Janeiro. João was drawn home in 1820 by a revolution, leaving his son as regent. When Portugal tried to reimpose colonial rule, the prince declared Brazils independence on Sept. 7, 1822, becoming Pedro I, emperor of Brazil. Harassed by his parliament, Pedro I abdicated in 1831 in favor of his five-year-old son, who became emperor in 1840 (Pedro II). The son was a popular monarch, but discontent built up, and in 1889, following a military revolt, he abdicated. Although a republic was proclaimed, Brazil was ruled by military dictatorships until a revolt permitted a gradual return to stability under civilian presidents.
President Wenceslau Braz cooperated with the Allies and declared war on Germany during World War I. In World War II, Brazil again cooperated with the Allies, welcoming Allied air bases, patrolling the South Atlantic, and joining