The state was created because of the economic success of the State of Grão-Pará and Maranhão. Sebastião José de Carvalho e Melo split that state into two states, the State of Grão-Pará and Rio Negro and the State of Maranhão and Piauí, thinking that this would cause even better economic conditions, though the state split would prove a failure.
1 1975 is the year of East Timor's Declaration of Independence and subsequent invasion by Indonesia. In 2002, East Timor's independence was fully recognized.