https://www.ssa.gov/international/agreements_overview.html
In a nutshell, all national pension systems work pretty much the same way in that, the longer you put into it, the more you get out. There is also minimum that you have to put in. For the U.S., it's 40 points (or 10 years).
Let's say you work 9 years in the U.S. but then decide to pack your stuff up and move to one of the above listed countries. You will get credit for 9 years worth of work and not have to start over in your new country (and the other way around too)
I'm actually conflating two different topics... one is reciprocal arrangement in terms of pension point system.
Another is, just being able to collect pension from abroad, which is actually not a big deal at all.
https://www.investopedia.com/ask/answers/110614/how-can-i-re...
Our tax dollars at work, I guess.
I did not know this. How does this work?