How did the atlantic slave trade contribute to the rise of some african states?

It contributed by A large number of the enslaved were destined to remain in Africa - many were transported across the Sahara to the north - which heightened the impact of the slave trade on the continent.Besides its demographic toll, the slave trade, and the Africans' resistance to it, led to profound social and political changes.

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What effect did the development of trade have on settlement patterns in medieval times