The pattern that I pointed out, that includes Von Braun, and Musk, is of people who, whatever their advantages and sins, were not privileged enough to be born in the US, and they then found unimaginably more opportunity in the US than in their homeland.

Is that how some people conceive of the "American dream"? I don't know, but I think it's the easiest to find factual evidence of happening over a long period of time.