Nah they would just invent new races. What’s the point of race? What does it mean exactly? Notice that the races in the US at least roughly align with economic classes.

That’s not an accident. Obviously without the concept of races, people would still have different skin color and hair, but the implications would be entirely different. Culture, neighborhoods, etc. wouldn’t be separated. And most importantly, it would be ever so slightly harder for rich people to make the majority feel like they’re in the same group as them as opposed to some “other”.

So if there was only one race, the rich would need to invent new ones.