I suspect this is correct. However, I have very little understanding of what a civil war would look like in the US today, and I'm not convinced that people seriously talking about it do, either. Certainly the Civil War itself, with its geographic focus, is the wrong model. Even strongly red states are only like 60-40, not 90-10. And despite what leftists would have us believe, I think we lack underlying ethnic and cultural striations that approximate the lines demarcating opposing sides for people living in close proximity. I can foresee guerilla tactics being employed by disconnected rogue militias against political targets, but don't see how that translates to a squaring off between the left and right. If the government were to start rounding up conservatives and putting them in concentration camps, for example, then that would probably foment a revolutionary war. Maybe leftists would be the Tories of such a war, but it's not the same thing as a civil war because the leftists will mostly be staying home while government goon squads do their dirty work.