“When the Negroes emigrate to the west, they can not gather as much light and warmth as they did in africa. So they turn red as copper, become redskins. That results from being forced to reflect some of that light and warmth.
This then glows copper red. They can not resist that. This is why the redskins get extinct in the west, in turn become a race that is ceasing to exist, dying of their own nature, that is receiving too little light and warmth, dying out because of the mundane.
The whites are actually the ones that develop the humaneness inside of them.” (Rudolf Steiner)
Source: Rudolf Steiner, Lecture on March 3rd, 1923 in Dornach. GA 349, page 61f