Your source on that? All the schools I’m in contact with are still as international as ever in their CS PhD departments. I’m not sure what the trends are outside of CS, but I can’t imagine they would be very different. I think you are just pulling this number out of thin air.
Research is funded quite differently from undergrad programs. Sure, fewer TAships are available, but your research funding is much more detached. DARPA and NSF aren’t going to become stingy all of a sudden.
> Regarding the "racism against Americans," there is no such race, and if there were one it would not explain research productivity.
If I claimed (without any evidence in fact) that “Indians or Chinese are less productive than Americans” I would totally be accused of racism even though both India and China are multi-ethnic. It is especially a stupid thing to say as foreign and domestic students are pretty diverse, with slackers (or dreamers) and very focused students on both sides.
So you're asking for a source when your own view is based on anecdotes? Great.
https://www.migrationpolicy.org/article/international-studen...
Growth has been falling, but that wasn’t the claim that was made, which was actually ridiculous.
Furthermore, this trend predates the immigration policies of the current administration, and I suspect this trend has further strengthened.
[1] https://www.insidehighered.com/news/2017/09/28/graduate-scho... [2] http://cgsnet.org/ckfinder/userfiles/files/CGS_GED16_Report_...
Regarding the full-paying foreign undergrads, their tuition contributes towards the costs of the university that are shared. American students, especially at middle-ranking public schools, are hurt when schools lose their funding.
Regarding the "racism against Americans," there is no such race, and if there were one it would not explain research productivity. What would is the self-selection of who will go across the world to study something technical, the much better high schools in other countries, and in the mere fact that the rest of the world is a larger talent pool than the US. It is easy to think of reasons.