Brazil, officially the Federative Republic of Brazil, is the largest country in both South America and Latin America. At 8.5 million square kilometers and with over 208 million people, Brazil is the world's fifth-largest country by area and the sixth most populous. The capital is Brasília, and the most populated city is São Paulo. The federation is composed of the union of the Federal District, the 26 states, and the 5,570 municipalities. It is the largest country to have Portuguese as an official language and the only one in the Americas, besides being one of the most multicultural and ethnically diverse nations, due to the strong immigration from various places in the world.