[ianburrell]

Also, other countries send lots of students to the US. Some become immigrants but lots go back home.

[alephnerd]

Also, US-Europe immigration is largely moribund, so familial and social ties to European states are much weaker now than 50 years ago.

Most immigration to the US now comes from Asian and LatAm states, so a lot of us Americans prioritize those problems and needs above Europe.