Racism, like a bunch of other biogtry, is an important tool these oligarchs exploit to stay in power and gain support from ignorant and under-educated poor people.

All these things are true and well documented. US housing policy is very much steeped in racism. Here's a video that sums it up pretty well:

John Oliver on housing discrimination

Why was there white flight? Racism. Why did they want to build freeways? For white flight. Don't get cause and effect mixed up.

Fossil capitalism filled the niche that resulted from racial segregation.

Yes "what's good for GM is good for America. " and so on. The runaway neoliberal capitalism is a huge problem, but racism is the true heart and soul of America.