[OneTimePetes]

The whole thing is further complicated, by significant differences, being- unimportant. As in- differences of the sweat glands do not make for real differentiation. Different coloured skin is a superficial- unimportant difference.

What would be a differentiator - aka different brain-chemistrys and neuro-types - are non-existent or omnipresent.

Taking neuro-types as adapted to circumstances, the characteristika usually fielded by racists, are almost always a expression of "percentages" of neuro-types thriving due to different historic circumstances.

If you spend several generations enslaved and waged war upon, those neuro-typus adapted to the circumstances - will make up a large part of the surviving population.

Racism causes history, and history causes perceivable "Race" because humanity adapts to whatever it goes through. Given enough "good time" generations, the "adapted survivors" retreat percentage wise and are replaced once again with peaceful neuro-types. Unless, the stressful conditions are artificially prolonged.