> Do you think the USA makes it easy to become a citizen?

Just because there are plenty of countries that make it easier to become a citizen doesn't mean there aren't plenty of countries that make it worse.

People going the H-1/O-1 route in a STEM field with an MS degree don't have a hard time becoming a citizen, unless they're Indian (and a little bit if Chinese). Literally everyone I know from my university and work days who went that route got it. A few got audited along the way, which added 1-2 years to the process, but they all still got it.

Now compare that with many friends of mine who left the US for ideological reasons and moved to countries where ... they have no hope for permanent residency, let alone citizenship. I just recently visited one of them - he has been in that country for 18 years, and is about to be kicked out because the economy is poor and they likely won't renew his residency status. For all those years, he never had a path to permanent residency (without paying a huge amount of money).

Another is a faculty member at a good university in the country he's in. He's surrounded by people who've spent their whole careers at that university and are now wondering where they'll move to post-retirement.

Yet another has spent almost two decades in a third country. He likes it, but admits the pressure to never lose a job and always find a stable one so he doesn't get kicked out does get to him sometimes.