I think one of two things would occur, which might account for 90% of american civilians.

1) there will always be underground ways of getting home, some genuine and others just an easy way to rip off people in need.

2) american civilians may see the distance back home, in these changed times, simply too far and hard. And home wont be what it once was. So they would make the best of wherever they were at the time and put down new roots.

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