That’s what happens. They destroy other states. Just like the yanks have done to NC
There, they'll be taught Economics 101 (like the law of supply and demand and diminishing returns), the US Constitution (simply broken down into parts and read in plain English, without a Marxist professor to "interpret" it for them) and US History by eager teachers who actually love America. Civics would also be a good subject.
Once they show some knowledge about this country and how it works they can graduate and move on to their final destinations.
Hell, maybe we can even send some back as double agents. I'd even contribute to their salaries!