I'm assuming that the United States wouldn't be so friendly to immigrants as it is currently - without the need for the manpower to run the National Reconstructions, I think the South would be a much tougher place to be an immigrant.
Take my family, for instance. We're Croats, who had to flee when the Swiss came out of their bunkers. Can you believe that the SWISS of all peoples used to be the neutral country of Europe? I can tell you from personal experience, the Schwietzer Reich is no joke! Once they realized that vast amount of salvage and natural resources available in the Great European Forest, they came out of their holes with a vengeance, let me tell you!* Swiss Exploration/Exploitation parties won't take no for an answer. Swiss reasource colonies are getting more common in Eastern Europe by the day. My family didn't want to be indentured servants building Grosse Zurich, and moved to Alabama, where there tolerance. Better a new country, than breaking my back building planes for the Schwiezer Luftwaffe.
The end of rationing in the 1990s was a real lift though - swinging times those, what with regular telephone service and the swing dance revival.
* The Swiss military is both larger than you might think, and stored a lot of its aircraft in gloriously bond villain mountain caverns that were hardened against atomic strikes. Combine a tucked away modern military, not being on anyone's target list, and the sheer number of IRBMS, fast bombers, etc. pointed at Western Europe by the Warsaw Pact, the Swiss could very well wake up to find themselves the ones partially intact, fully armed society in Europe.