Black people were not kidnapped from the jungles of Africa, they were purchased from tribes that won battles. The losing tribes peeps were kept as slaves by the winning tribes and subsequently traded from there. The Europeans capitalised on that and America got blamed for the whole thing.
If Alice robs a jewelry store and sells the stolen jewelry to Bob and Dave, Bob still owns stolen jewelry. Legally, it doesn't even matter whether Bob knew the jewelry was stolen or how much Dave bought.
But that's leaving aside the gaping hole in your argument. We have decided as a society that no human can be the property of another. Thus, we don't speak of "buying" "trading" or "stealing" people, it's all just kidnapping. I'm not saying that the African tribes were saints (they weren't) or that Europeans didn't have slaves (they totally did, and they were pretty mean to them). But we live in the U.S.A, here and now. Part of our society is at a systematic disadvantage, due to the history we've already discussed. That is making our country poorer, and above all it's morally wrong.
