 In Senegambia, between 1300 and 1900, close to one-third of the population was enslaved.In early Islamic states of the Western Sudan, including Ghana (750–1076), Mali (1235–1645), Segou (1712–1861), and Songhai (1275–1591), about a third of the population was enslaved.In Sierra Leone in the 19th century about half of the population consisted of slaves.