as well as indoctrinating Chinese, who often think America is heaven.

Leif Erikson discovered America long before Columbus but Scandinavians don't have an organised lobby in the US to push this fact, although it is a fact. Indians, Islamists, etc. (and of course good old Uncle Sam) do have government-supported lobbies to indoctrinate Americans (who are the only people that really matter in the world currently, thanks to an overwhelmingly powerful military) with fake facts.

(I don't mention American blacks because many Afrocentrism supporters are probably white SJWs.)

Besides, saying something "doesn't matter" doesn't negate its existence.