From the 17th to the 19th century, the main political entities in the area were the Kingdom of Dahomey, along with the city-state of Porto-Novo, and a large area with many different nations to the north. This region was referred to as the Slave Coast from as early as the 17th century due to the large number of people who were kidnapped and trafficked to the New World during the Trans-Atlantic slave trade. After slavery was abolished, France took over the country and renamed it French Dahomey. In 1960, Dahomey gained full independence from France. The sovereign state has had a tumultuous history since then, with many different democratic governments, military coups, and military governments. A self-described Marxist–Leninist state called the People's Republic of Benin existed between 1975 and 1990. In 1991, it was replaced by the current multi-party Republic of Benin.