So they went from living in an empire to being sold as slave? was there not an empire after mali in the same general location?
I don't know whether to answer your question or give you one of these
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The empire before Mali was Ghana, which was founded by a Mandinka people called the Soninke. Mali was the successor to Ghana. Mali stayed in existence, but went into decline after Songhay arose. Songhay also had a lot of Mandinka people as their elites. Some Mandinkas helped formed new Kingdoms to the East, South, Southwest and West of Mali. Some of the new Kingdoms were the Mossi Kingdom which is in modern day Burkina Faso (formed by Mandinka prince and Mamprusi princess); the Gonja Kingdom in modern day Northern Ghana; the Kong Kingdom in modern day Northern Ivory Coast and Kaabu in modern day Guinea Bissau. The Mandinkas also formed other Kingdoms in Sierra Leone and Liberia. None of those Kingdoms were as powerful and as strong as Mali.
Fwiw, the Akan people (Ashanti, Baoule, Abron/Brong, Fante, etc.) of modern day Ivory Coast and Ghana are originally from the Kingdom of Ghana. They moved into the forest belt due to conflict in the Kingdom of Ghana. The Akan people formed the Bonoman Empire and of course you know their story later on.
No the people in those regions did not just go into slavery. It is much more complicated than that, but we as African Americans have not been taught the basics of a lot of the conflict. You first have understand the different ethnic groups and then realize that the Europeans armed a lot of the smaller ethnic groups in order to take down the larger more power ethnic groups. The larger ethnic groups were the ones that had the centralized governments and had subjected the smaller ethnic groups. It was the smaller ethnic groups from the forest belt regions that warred upon the larger groups. African Americans don't know a lot about Africa and Africans, because White Americans stopped bringing Africans directly from Africa into the Americas fairly early on in slavery. So by the time of the Civil War in the USA a typical African American family had been in the USA for 5 or 6 generations. So there was no knowledge to pass on, but the remnants of the African culture remained and was reinforced by successive waves of Caribbean people that were shipped into the Americas.