"Remember, the X-Men universe was created in the early '60s in the height of the American Civil Rights movement. So, these ideas of bigotry, tolerance, fear, war ... I think are perpetual ideas. We've had them for thousands of years, ever since man recognized his fellow man and that two people had two different color hair."
January 1, 1970
https://en.wikiquote.org/wiki/X-Men_(comics)