US vs Canadian truck drivers

No, I’ve never thought about trucking in the US as I know it is out of the question, due to visa restrictions, although I have watched a video not long time ago , one US driver saying he met one young Polish driver, he about 26 yo, said he did 2 years truck driving in Poland, then moved to the US and was working as an OO there, saying he wouldn’t do anything else.
So, I guess there is a way to get there, but must be a very complicated one.