As far as I can make out we got here because of the extreme racism of Amerindians. They didn't consider Europeans, Blacks or East-Asians full human beings. They considered all of us untermensch. So they chose the symbolic colour of Red people because for them this denoted superiority. The Red White and Black schema was quite convenient in the early days of the North American Anglosphere so Europeans went along with it. Then when significant numbers of East Asians turned up, they were assigned the symbolic colour of yellow, probably because of the Japanese association with the rising sun, to fit in with this schema.
For the Liberals Europeans have to be the source of every evil. You notice in their pathetic fantasy world Trump has become the creator of Covid-19. How they think Trump would have had the opportunity to create and disperse such a virus is beyond me. Anyway it seems that Liberals invented on origin story for the racial colour coding, that Europeans were so stupid, bigoted and ignorant that they couldn't tell that East Asians were as white and in same cases whiter than the European races.