brazil's largest african and mixed populations are in
Demographics of Brazil In the Northeast, which received large masses of African slaves to work in sugarcane, tobacco and cotton plantations, people of African and mixed-race descent predominate, mostly on the coast, whereas in the semi-arid country land (usually called sertão) there is a predominance of white and Amerindian-European mixed people. Most of the black or mulatto people in the sertão are descended from freed African slaves or mulattos who fled inland from the coast and worked as cowboys for semi-feudal lords. The city of Salvador da Bahia is considered one of the largest black cities of the world. In the Northwest (covering largely the Brazilian Amazon), a great part of the population has distinguishable ethnic characteristics that emphasize their Amerindian roots. Other ethnic groups have merged with the Indigenous tribes there. This region is not densely populated, and "caboclos", people of mixed native and European descent, are a small part of the entire Brazilian population.
List of territorial entities where Portuguese is an official language Although Brazil is the only Portuguese-speaking nation in South America, it has the largest population, area and economy on the continent. Thus, the South American trade bloc Mercosul uses Portuguese alongside Spanish as its working languages. A Spanish influenced Portuguese dialect is spoken in the northern Uruguayan border area with Brazil. Given the proximity and trading relations between Portuguese speaking Brazil, and its respective Spanish speaking nations, Portuguese is offered as a foreign (or obligatory) second language course at most schools in Uruguay, Argentina, Paraguay, Venezuela and Bolivia.