I posted something when I was new do DU saying I was concerned about a second civil war.

[Hortensis]

36. As you say, but if a far-right authoritarian government took over

it's likely most of our nation would fairly quickly be brought under the control of a government with formidable assets to quash troubles it didn't approve.

So far we do seem to have a currently blocked coup in process and some dispersed, domestic terrorism troubles that serve the insurrectionists. If we win, imagine they will continue for a while.

Speculating more, it seems likely that various points some states would resist, refuse federal authority where it was unacceptable, and if necessary ultimately military force would be used to gain control. That would qualify as civil war, but federal military consolidation of power would be much, much, much faster than the first one and involve few civilians except as collateral damage.