“Helots, who were their kinsmen. “
Because we see race differently from previous times.
I find it amazing that the English in the 1700s and 1800s consider the IRISH as a separate, inferior, race.
Since we can all interbreed, the entire concept of race is partially made up by us humans. Tribalism
I think tribalism is the answer. If we can believe that any group of people is other than ourselves, i.e. of a different tribe, we can dehumanize them and often do.