Maybe this is too fedposty (and let me know if it is), but I’ve been thinking about this a lot, especially with how things are going in Iran. It seems like modern warfare is basically just “my drones strike your drones”, and if either side has drones free to not strike other drones, they can instantly kill whoever they like. With this in mind, is it even really possible for a revolution in the US to escalate into a civil war without simply being air-superiority’d into oblivion with modern sensors? Is guerilla war viable anymore? The main counterpoint I can think of to this possibility is that the US military is A: incompetent and B: mostly a colonial garrison force, but I don’t know.
(And yeah, I know a revolution in the US would have a whole laundry list of prerequisites and is significantly hindered by the fact it can’t be tied with anti-imperial nationalism. I’m talking strictly in terms of if it actually happened.)
Actually most of the Russian Civil War was fought by guerrilla warfare on all sides. Direct military action was limited due to horrible state of logistics.
In Russia the military partially disintegrated and partially split between Reds and Whites. In fact, Bolsheviks at first tried to completely replace professional military with militias (Red Guards and assorted forces), immediately got catastrophically owned by Germans and small segments of the old army that sided with Whites and then began to build the Red Army as a proper army.