Why don't you take the time to provide your sources?

Why do I need to scour all of the existing literature to verify a claim that someone else made that I feel dubious? It's on the person who posited the initial claim to prove their claim.

After all, my tribe, which is a Native American tribe, hates people that are not Native Americans so much so that if they have a good reason to believe that somewhere back in your genealogy, 150 years, there's a drop of white blood, you're considered a white person.

So I have lived experience that throws some shade on the claim that all racism springs from capitalism because my tribe is not capitalistic.

Can you prove me wrong with verifiable external sources?

Well, many people are racist and would be racist in any political system, but capitalism abuses love of concentration camps of all types for profit and repression.