[anon291]

> I don't know why no one disagreeing with you will engage.

It's a common problem on HN; very used to it at this point.

I do agree that immigration plays a part as well, but immigration is also driven by pre-existing differences. The US must have done something that made so many migrants want to study here over other countries, and I think this is because American universities have been good for a very long time.

EDIT: Sorry you're being downvoted too. What a strange world.