[probablynish]

> Every foreign employee getting that tech job is a US citizen from the Midwest not getting it.

This concentration of high paid tech jobs would not exist in the first place if it weren't for the foreigners. Look at the number of tech startups founded by immigrants. More broadly consider that if a different country became the global hub for top tech talent, capital would go there, and that country would become the home of high paid tech salaries.

The main input into a tech company is 'human capital' (hard working, highly intelligent, people) - Americans benefit from the spillover effects of having their country be the global nexus of human capital.

BTW, India is seeing significant upwards pressure on tech salaries and a boom in the number of domestic tech companies and jobs. This is at least partly spurred by restrictive American immigration policies forcing Indians to go back home. Purely economically speaking, I don't think America is the winner here.