Cape Verde with the colonial masters, who nevertheless refused to provide the local authorities with more autonomy. In 1951, Portugal changed Cape Verde's status from a colony to an overseas province in an attempt to blunt growing nationalism. In 1956, Amílcar Cabral and a group of fellow Cape Verdeans and Guineans organised (in Portuguese Guinea) the clandestine African Party for the Independence of Guinea and Cape Verde (PAIGC). It demanded improvement in economic, social and political conditions in Cape Verde and Portuguese Guinea and formed the basis of the two nations' independence movement. Moving its headquarters to Conakry, Guinea in 1960, the
Boa Vista, Cape Verde salt deposits, which were mainly exploited by the English. In 1820, after many pirate attacks, the population moved to Porto Inglês, later renamed Sal Rei, which had been founded at the end of the 18th century. As did much of the Cape Verdean economy, the exploitation of salt on Boa Vista also relied largely on slavery. A Portuguese-British commission to end slavery was established in Boa Vista in 1842, but slavery was not completely abolished until 1876. Until 1935 the municipality of Boa Vista also covered the island of Sal. In 1975, Cape Verde declared its independence. Administratively, the island