I hope that was sarcasm.
I can't think of ever reading about any culture that DIDN'T practice slavery at one time or another (in ten thousand years of human civilization). That uncludes Africa, Europe, the Middle East, Asia, etc. It also include both North and South America.
BTW, the Africans sold into slavery in the period you mention (1500-1865) were captives taken from interior tribes that the Coastal African tribes didn't want to retain as their own slaves.
of course. ; ^)