Rural America was never the same after the invention of the automobile. And the taxman. But the really big twist was Lying Tv. It made the world an exciting place. The dingy dirty city became glamorous. The farm boys wanted what those big city folks had. Sex drugs and rock&roll. Money for nothing, chicks for free.
As for the reverse migration to the country. What I’ve alway surmised. The first nuke to hit an American city and its happening overnight. Or the first Electromagnet pulse causes one second of damage to thousands of transformers. No one has a plan for anything, it just happens. Freedom of travel or panic. The migrants from Syria to Germany won’t be pushed back after they see the luxury and goods in the stores. The invaders will fight to stay.