Brazilian Federal District
The capital of Brazil was transferred from Rio de Janeiro to Brasília on 21 April 1960 and its new territory, split off from state of Goiás on the border with the state of Minas Gerais, became the current Federal District. After the transfer the old Federal District, containing the city of Rio de Janeiro, became the state of Guanabara. This state existed from 1960 until 1975, when it merged with the state of Rio de Janeiro. With the merger the capital of the state of Rio de Janeiro was transferred back from Niterói to Rio de Janeiro itself (as it had been until 1834 when the empire created the Neutral Municipality).