Boy, did you ever hit the nail on the head.
Slavery has been part and parcel of the human experience ever since there have been humans. Whether the slaves were captives from war, bought or traded for food, horse, whatever, slavery has ALWAYS been around.
Our Judeo-Christian roots, via Europe, finally stopped the trade for the West, north of the border.
Besides, I've been to Africa (Kenya) and KNOW that American blacks are a ZILLION times better off HERE in the USA.
Those with ANY brains know that.
The American chapter on slavery would be pamphlet size.
As late as WWI, Portugal turned a blind eye to slavery in her colonies, specifically, Angola.
Cacao, instead of cotton...