Africa and America are different in the way that the colonialism developed. To Europeans, Africa was more like a method in the trading system. They not only got the natural resources from it, but also used the people there as the free labors. In opposite, America developed in a totally different way.
you could go check in: https://sites.psu.edu/afr110/2014/12/11/comparison-between-the-african-colonialism-and-american-colonialism/comment-page-1/
