Actually, there IS one place on earth where there continues to be a brisk trade in black humans on sale as slaves, and female "circumcision" and such as that. The place? Africa. Yes, in Africa, one tribe still raids and carries off members of other tribes for sale, mostly to Arab states, as slaves just as they did four hundred years ago.
The white people, mainly Dutch, who bought black people and made them serve as slaves in the sugar cane fields of the New World, could not have done so without the active cooperation of the African tribes who were selling their brothers into that slavery themselves. So you can blame whites for slavery until you are blue in the face; it was African blacks who were responsible for starting this curious institution, not whites.