Tell this to the dumb wokies who think that slavery was invented by white people, and only practiced by white people.
https://en.wikipedia.org/wiki/Slavery_in_Japan
Further insult to injury: the Japanese were more troubled by Christianity than selling slaves.
https://www.theoccidentalobserver.net/2017/12/26/review-the-jesuit-order-as-a-synagogue-of-jews-part-one/