The Ashanti were an African tribe that lived in what is now Ghana and were regional top dogs in the 1600-1800s. They conquered neighboring tribes, enslaved some of them, a portion of which were sold to white slavers.
While Americans imported slaves bought from the Ashanti, we did not harvest them in the same manner. Had we followed such practices, we would have brought back many thousands of Mexicans in chains in the early 1840s as a result of winning the Mexican-American War. Recall that slavery was still being practiced in the US at the time.
I've read many accusations that America was built on slavery, but it seems to me that the Ashanti Empire was a little more direct in that area. No doubt many more examples can be found.
See also: Aztecs.