[Monty22]

No, I meant people fleeing the cities. What they don't directly nuke, they'll probably dirty bomb.. I'd expect few nukes due to logistics, lots of dirty bombs.. A lot of land would be uninhabitable.

I didn't mean the food/water.. Just the space.

[eno_]

A lot of land would be uninhabitable.

Only many dirty nukes could contaminate enough land to create a significant food supply problem. Conventional explosives with radioactive material cannot contaminate a large area.

I'm sure there would be some level of disorder, but the U.S. would not fall apart even if there were a nuke detonated in a U.S. city.