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,
Cape Verde–United States relations (Prime Minister Neves also visited the U.S. in September 2007.) The United States provided emergency humanitarian aid and economic assistance to Cape Verde in the period immediately following Cape Verde's independence, as well as after natural disasters, including a hurricane that struck the island of Brava in 1982, and after a severe volcanic eruption on Fogo in 1995. Cape Verde also is eligible for trade benefits under the African Growth and Opportunity Act (AGOA), and has signed an Open Skies agreement to facilitate air travel safety and expansion. On July 4, 2005, Cape Verde became the third country to sign