Original: After the transfer , the municipality of Rio de Janeiro became the Estado da Guanabara ( State of Guanabara ) , which existed from 1960 until 1975 when the State of Guanabara and the State of Rio de Janeiro merged , to be named the state of Rio de Janeiro .
Simplified: Afterwards , the municipality of Rio de Janeiro became the Estado da Guanabara ( State of Guanabara ) , from 1960 until 1975 .