History of Cape Verde return, Portugal signed the 1975 Algiers Agreement. On July 5, at Praia, Portugal's Prime Minister Vasco Goncalves turned over power to National Assembly President Abilio Duarte, thus the colonial history of Cape Verde ended when Cape Verde become independent. However, there was no armed conflict in Cape Verde and ultimately independence for Cape Verde resulted from negotiation with Portugal. However, the catalyst for the independence of Cape Verde was the PAIGC branch in Guinea-Bissau, which launched an ultimately successful war against the Portuguese in Guinea-Bissau, who eventually compelled Portugal to accept independence for Cape Verde. Immediately following a November 1980
History of Cape Verde coup in Guinea-Bissau (Portuguese Guinea declared independence in 1973 and was granted de jure independence in 1974), relations between the two countries became strained. Cape Verde abandoned its hope for unity with Guinea-Bissau and formed the African Party for the Independence of Cape Verde (PAICV). Problems have since been resolved, and relations between the countries are good. The PAICV and its predecessor established a one-party state and ruled Cape Verde from independence until 1990. Responding to growing pressure for a political opening, the PAICV called an emergency congress in February 1990 to discuss proposed constitutional changes to end one-party rule.