Almost none. I went to engineering school at a major state college in the US, and it was nice to find even an immigrant who had been mostly raised here in the same program.

American elites abandoned Americans after the Soviet Union fell. Only useful as a servant class. They also encouraged parents to abandon their children. Immigrant parents come here and work like mules, spoil and dominate their children, and would never imagine that kicking them to the wolves was a virtue. In the US (and in the West in general), we teach working people to have contempt for their own offspring; it's counter-evolutionary. Meanwhile Western elites spare nothing for their dimwitted failchildren.

The default I expect from any intellectual or technical achievement is a truly challenging last name.