No mater where you came from, if you go back in time, there will be someone related to you who was a slave. We still had it in the 50’s and it may still persist today in the form of labor camps if not down right auctions in Libya and ISIS occupied areas. Those are the known ones, I am sure there are many other examples.
A freeper told me there were thousands and thousands more Irish slaves than there ever black slaves, sold into slavery by the English in the past. I looked it up and it was astounding.