>>213576966 (OP)They didn't run on a slave economy on their own territories. Slaves being black had many system advantages, since you could read someones legal status by identifying his skin tone and race. That way you could shape the land and police easier.
When the US became more stable in terms of governing, the cost of identifying blacks became less high, so to speak. There were ways to tell social status, the Law was being enforced and many other things.
While colonialism was going on, people didn't think of themselves as races, but as peoples, like a certain region would bring out a certain people. Even germans pre-naziism thought that, a harsh climate would make a harsh people.
The race thing came to be when Nazis dabbled in occult and esoteric knowledge, trying to invent Phrenology and other systems to construct a sort of nation-race, ultimately a homogenous and superior people, driven by the idea of breeding superhumans, which is partially rooted in Mendel.
The CIA picked up the records and the scientists, mostly.
