ATM what I see in the Republican Party is their conundrum concerning Trump more than anything. The fucker is out of power. His constituency can't vote for him for 4 years and likely he's toast for a POTUS candidacy and of course he's way too proud to run for anything else. His power will wain, and if the Republicans are smart they'll repudiate him. But, of course, most Republicans are not smart people at all.
Civil war? No, I don't see that coming. Terrorists exist and they will be dealt with as incidents arise. The FBI will infiltrate, get a leg up on these guys. The NG is more than capable of putting down anything resembling an uprising. The armed alt-right are living in fantasy worlds. They had their moment Jan. 6 and I hope any culpable will regret what they did that day.