[tripletao]

Intra-white racism was totally a thing in the USA. Jacob Riis ("How the Other Half Lives") is sometimes considered to have had progressive views on race, because he didn't consider black people to be strictly worse than white; but that probably just reflects his low opinion of Southern Europeans.

Such racism is mostly dead now, because generations of generic-white intermarriage would make it hopelessly confusing. My suspicion is that as long as distinct races are perceived, racism will continue, and the absence of that intermarriage is simultaneously evidence of that racism and a cause of it.