Portuguese Cape Verde cocoa plantations of Portuguese São Tomé and Príncipe. In the lead-up to and during the Portuguese Colonial War, those planning and fighting in the armed conflict in Portuguese Guinea often linked the goal of liberation of Guinea-Bissau to the goal of liberation in Cape Verde. For instance, in 1956, Amílcar and Luís Cabral founded the African Party for the Independence of Guinea and Cape Verde (PAIGC). However, there was no armed conflict in Cape Verde, and ultimately independence for Cape Verde resulted from negotiation with Portugal after the April 1974 Carnation Revolution. In August 1974, an agreement was signed in
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