This is a small fraction of the history of slavery in Africa.
French historian Fernand Braudel noted that slavery was endemic in Africa and part of the structure of everyday life. "Slavery came in different guises in different societies: there were court slaves, slaves incorporated into princely armies, domestic and household slaves, slaves working on the land, in industry, as couriers and intermediaries, even as traders".[20] During the 16th century, Europe began to outpace the Arab world in the export traffic, with its slave traffic from Africa to the Americas. The Dutch imported slaves from Asia into their colony in South Africa. In 1807 Britain, which held extensive, although mainly coastal, colonial territories on the African continent (including southern Africa), made the international slave trade illegal, as did the United States in 1808.[21]
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. In the 19th century at least half the population was enslaved among the Duala of the Cameroon, the Igbo and other peoples of the lower Niger, the Kongo, and the Kasanje kingdom and Chokwe of Angola. Among the Ashanti and Yoruba a third of the population consisted of slaves. The population of the Kanem was about a third slave. It was perhaps 40% in Bornu (1396–1893). Between 1750 and 1900 from one- to two-thirds of the entire population of the Fulani jihad states consisted of slaves. The population of the Sokoto caliphate formed by Hausas in northern Nigeria and Cameroon was half-slave in the 19th century. It is estimated that up to 90% of the population of Arab-Swahili Zanzibar was enslaved. Roughly half the population of Madagascar was enslaved.[22][23][page needed][24][25][26]
Slavery in Ethiopia persisted until 1942. The Anti-Slavery Society estimated that there were 2,000,000 slaves in the early 1930s, out of an estimated population of between 8 and 16 million.[27] It was finally abolished by order of emperor Haile Selassie on 26 August 1942.[28]
When British rule was first imposed on the Sokoto Caliphate and the surrounding areas in northern Nigeria at the turn of the 20th century, approximately 2 million to 2.5 million people there were slaves.[29] Slavery in northern Nigeria was finally outlawed in 1936.[30]
Elikia M'bokolo, April 1998, Le Monde diplomatique. Quote: "The African continent was bled of its human resources via all possible routes. Across the Sahara, through the Red Sea, from the Indian Ocean ports and across the Atlantic. At least ten centuries of slavery for the benefit of the Muslim countries (from the ninth to the nineteenth)." He continues: "Four million slaves exported via the Red Sea, another four million through the Swahili ports of the Indian Ocean, perhaps as many as nine million along the trans-Saharan caravan route, and eleven to twenty million (depending on the author) across the Atlantic Ocean"[31]