Go to any top STEM PhD program and do a headcount. I don’t know what’s going on now thanks to this wave of xenophobia and funding cut madness, but back when I was in one (Princeton Physics, that was last decade), everywhere I go it was at least 50-50 in terms of international representation. You can also count the massive number of clearly foreign born faculty. It could not be more obvious.
Edit: And before you mention O-1 and friends for highly accomplished individuals (maybe that's not affected for now? Honestly have no idea), this kind of policy has wide ranging second order effects even if it doesn't affect top talent directly. Like I said I was U.S. educated myself, once I would encourage bright minds from elsewhere to pursue a higher education in the U.S., now I heavily advise them from even setting foot in the U.S.
> Go to any top STEM PhD program and do a headcount.
Intelligent Americans rarely go through the hazing ritual that is a PhD because its financially stupid unless you’re rich.
Why would an American smart enough to become a stem phd toil away for a decade in poverty under an abusive university system instead of becoming rich in tech?
> Go to any top STEM PhD program and do a headcount
Having done a STEM PhD, No. STEM PhDs are merely easily exploited labor by STEM departments. The PhDs and postdocs from foreign countries are typically a notch lower than the US PhDs and postdocs (especially the postdocs, because in many foreign countries you can do a 3 year PhD). It's just that most americans won't accept 100 hour workweeks in exchange for a $50k paycheck, and won't falsify the science to stay in pursuit of the next rung on the academic ladder.