It's retired CIA analysts who specialize in civil wars and the symptoms that show high risk that pointed to the current state of the US in an interview on PBS. Noting that the precarity of the people combined with the uprising and political takeover of federal and state governments by the white Christian nationalist movement is going to lead to a conflict of interest neither tolerable in its contentious state, nor reconcilable by nonviolent means.

Essentially BLM (The public) vs. the law enforcement state. It'll look like La Résistance versus the German occupation of Paris, with another layer of communication security / surveillance on the internet.

The US Armed Forces are not supposed to be deployed in the states, as we saw during Trump's term. They'll be extremely resistant to take sides, and it's not clear if they're going to want to side with the guys who are slaughtering drag queens and running thr prison complex like concentration camps, even though that will be the side that has legal authority over them, yet issuing illegal orders to them.

But unlike the German Reich, the US is huge and a lot of different things will be going on at the same time. There will also be more opportunity to interfere with the complexity of government and logistics of supply. It compares to the land war in Asia problem.