Relax, Americans aren’t used to seeing and responding to an actual oppressive regime nor have the capacity for supporting meaningful change. Plus the military structure is so well defined, there would be very little chance anyone would fragment or opt to join a “side” except for the active government. Most you would see is a bunch of useless resignations.

In true American fashion, everything you fear will just happen really half assed. If there is even a hint of a civil war, it’ll be snuffed out by your favorite 3 lettered agency long before it begins.