If anyone's interested there's a very interesting, utterly terrifying podcast called It Could Happen Here whose first few episodes are dedicated to a sort of thought experiment about how the next American civil war could happen. It begins by predicting basically the George Floyd protests a year before they happened and the mass violence that ensued, posits that a few hillbillies with IEDs could shut down the highway system along with much of the US economy, and uses ISIS's open source weapons manufacturing and Apple Store drones with bombs to counter the notion that an insurgency couldn't fight the US military. It's a very well researched hoot.
https://www.iheart.com/podcast/1119-...-war-30751081/