This will be metro chaos vs rural with guns & food .
First to go should be the bridges across rivers to the the major cities. Ever see the movie where New York City becomes a prison?
If Pennsylvania isolated Philadelphia it wouldn’t be a red state.
If New York isolated NYC....
If Massachusetts isolated Boston...
If Maryland isolated Baltimore...
That’s the way it would work; electrical towers and sub stations blown, bridges blown, freeway overpasses blown, main water transmission lines blown, pumping stations blown, main and secondary roads IED’d.
Cut them off; let them die of thirst, starvation, and in the winter, freeze to death in the cold and dark.
In 7 weeks they would be hunting, killing, and eating each other.