The Caribbean was occupied by indigenous people since at least 6000 BC. When European colonization followed the arrival of Columbus in Hispaniola, the population was quickly decimated by brutal labour practices, enslavement and disease and on many islands, Europeans supplanted the native populations with enslaved Africans. Following the independence of Haiti from France in the early 19th century and the decline of slavery in the 19th century, island nations in the Caribbean gradually gained independence, with a wave of new states during the 1950s and 60s. Because of the proximity to the United States, there is also a long history of United States intervention in the region.