A few caveats -
The “other” side is going to have the cash and foreign contacts, disproportionately so. There will be global chaos but they will have most of the negotiable wealth.
They could, depending on the global fallout, import food and hire mercenaries, foreign and domestic, with the wealth and food. The most important thing in war is money.
So there is more complication here.
With what surviving infrastructure?
Take out the damn cel phones and the protesting millennial snowflakes will be in tears. Blow up Starbucks and they have no way of coping at all.
Seriously. Who is going to fight this war for the leftists?
Antifa and BLM are protected from us by the law. Remove that and they won’t last a day..