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,
Economy of Cape Verde are paved. The new Praia International Airport is currently operative. Cape Verde is considered a developing country, and is included on the list of the United Nations Small Island Developing States. In 2007 the United Nations graduated Cape Verde from the category of Least Developed Countries, only the second time this has happened to a country. On December 18, 2007, the General Council of the World Trade Organization approved a package for the accession of Cape Verde to the WTO. Accession was effective on July 23, 2008, 30 days after ratification by Cape Verde, which took place on 23 June.