@petra @machciv @Starprophet1 @CatLord @TrevorGoodchild @professionalbigot69 South America is the way it is because of the importation of African slaves, Indio's, and those two intermixing and generally overwhelming the old European over-class. A solar system settled with a combination of Mars bases, Moon bases, and a great many O'Neil cylinder habs will not have any problems with natives or ethnic mixing, at least not on any great scale.

The people that go out and settle in the first few waves are going to largely be self selecting and homogenous. Pajeets, black Africans, and Jews aren't generally known for being frontiersmen and adventurers. They usually show up only after towns are established and running. There's also the fact that it's a lot harder to just walk or sail up to a habitat and set up shop compared to a terrestrial town. The people inside have to decide to let you in. A nation-state made up of 40 or 60 O'Neil cylinders chained together that was built by white Europeans who fled the diversity of Earth are unlikely to repeat the mistakes of their ancestors.