Cape Verde when Portuguese explorers discovered and colonized the islands, establishing the first European settlement in the tropics. Ideally located for the Atlantic slave trade, the islands grew prosperous throughout the 16th and 17th centuries, attracting merchants, privateers, and pirates. The end of slavery in the 19th century led to economic decline and emigration. Cape Verde gradually recovered as an important commercial center and stopover for shipping routes. Incorporated as an overseas department of Portugal in 1951, the islands continued to campaign for independence, which was peacefully achieved in 1975. Since the early 1990s, Cape Verde has been a stable representative democracy,
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.