OK, lets constrain this unCivil war thought experiment to Washington state.
You have the Wokians on the Coast, but mostly in Seattle, and you have the MAGA on the other side of the Rocky Mountains living in small farming towns.
unCivil War is declared! Who will win? Place your bets. Do you got your rations stocked?
War will never be declared
America and China are at war, nothing official has been declared, and probably never will be. Even if the CCP invades Taiwan. We still send manufactured goods and raw materials to each other. But, we are doing things to each other that you would only do if you were at war.
The war mongers are enjoying this time of "silent wars". Using silent weapons, with built in plausible deniability.
The Middle East is at war. The European Union is at war. The Orient is at war. There is war all over South America. And Africa too.
The Wokians are already at war with the Not-Cs (Not communist) and are already attacking them, verbally, financially and physically. (MAGA, according the Wokians, have already declared war, just by existing. "Trump is a King")
We are at war, there has just been no starting pistol, and their won't be.
(If there was, the Wokians would be dead or starving in the dark, in their gated communities by next Tuesday)
Most analysts leave out the Third Side
There is a group that has been behind all the modern wars. They have pushed the wars, or even enacted false flags to start the wars, and have even just made up wars.
And they are behind (as in, they have been paying for the propaganda, and certain rioters) the Wokians vs the MAGA unCivil contention.
If this group wasn't pushing so hard, both sides would probably have drawn up a cease-fire and segregated themselves. It is what the Wokians want most of all, a group, OVER THERE, that they can hate.
However, what we have is some groups paid to commit atrocities. To burn down their own cities (actually they are bussed in from elsewhere) and destroy the society. (the social fabric) And i am pretty sure we will see "terrorist attacks" where sleeper cells are activated to do even greater atrocities so that "war" can be declared against the "home grown terrorists", and the draconian laws will be blamed on the "other side" and get people to start attacking, and destroying themselves more.
The failing infrastructure WINS!
If there was really a MAGA Force. If the Wokians weren't just a bunch of yappy dogs. And war was declared, by the end of Tuesday, the big cities would have their power plants destroyed/electrical substations put out of commission. Water supply cut off. Food services halted. And maybe even, all the plumbers and electricians have moved out of the cities.
Of course, the Wokians control all the ports, so those MAGA will be facing empty Wallymarts.
I doubt any of this will happen… by choice. However, i do believe all this infrastructure is teetering on the edge, and one good kick could send it over. And i believe there are some insane people who want to start kicking.
So, all the "effects" you usually see in a war, may come about just because the infrastructure is way long in the tooth.
I really, really, really hope we have peaceful separation/segregation, and then wiser heads set up ways for trade to continue without people dying.
However, i believe we have radicals on all three sides that do not want to see this happen.
So, we will see tension escalate, anger flare up, and people going off half-cocked.
If you are in the probable war zone, i strongly suggest you move. (unless of course, you are looking forward to the fight) The Wokians will try to take the fight to the rural MAGA and find out that it is MILES in between farms. Their little electric cars will be stuck on the side of the road, the war effort stalled.
Watch for the false flags, and plan to protect infrastructure. And not from the "enemy" that should be over there/come from that direction. Most of the damage will come from the third group.