How did the trans-atlantic slave trade affect relations between the kingdoms of africa?

 It affected Africa by the overwhelming impact on Africa of its involvement in the creation of this modern world was negative. The continent experienced the loss of a significant part of its able-bodied population, which played a part in the social and political weakening of its societies that left them open, in the nineteenth century, to colonial domination and exploitation.

I hope that helps my dudes and dudettes!