If we did have this "civil war"...

[Person Man]

What we could be likely heading towards is a situation where armed protesters try to prevent the collection of taxes or the enforcement of unpopular laws. Maybe they engage the National Guard or local police militarily whenever they can with the goal of turning places like rural Virginia or the entire Dallas metro area into "No Go" zones....or at least make it a bit of a challenge for the state government to enforce their laws. Perhaps the local police start to rely more and more on local armed counter protesters. I can definitely see this as almost likely in any "Bad Case" scenario in the 2020s and 2030s.

It all eventually ends on one side giving up for at least a while and things "returning to 'normalcy'" or the gloves come off and we get an ad hoc dictatorship-style situation where the country becomes either an Iran-style situation like in Upon a Cross of Globalism where there are still elections, but where the Electoral College basically de facto rules the country or a situation where things are much blurrier and where power is generally transferred militarily.

It could actually be very similar to how things were in the Gilded Age when unions were illegal and a lot of labor relations were conducted violently.