Umm actually the victory at the end of the civil war would have only have affected America. Santa is in the North Pole which, if I’m not mistake, is international territory

yes . but however many slaves escaped to canada (northern part of its is really close to the north pole) however no one would go to north pole

If Santa had continued using blacks, they would hear about the war’s outcome sooner or later and then stage a revolt. Santa wished to avoid that.

That explains why toys and gifts are so much better, nicer, and advance now :)