The Federative Republic of Brazil is a union of 27 Federative Units (Portuguese: Unidades Federativas, UF): 26 states (estados) and one federal district (distrito federal), where the federal capital, Brasília, is located. The states are generally based on historical, conventional borders which have developed over time. The Federal District is not formally a state, but shares some characteristics of a state as well as some of a municipality.

More information, maps and a list on the Wikipedia page [1]

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