I don't know about a war, If Trump is elected I see the courts spending 4 years sorting out the mess. I can't see a vast number of citizens mounting any type of uprising that would even need the National Guard. A bunch of idiots maybe, who'll end up like the bozo's who are now serving time for Jan 6th. Nothing like what happened in 1860.I don't know what it's like on the inside but from outside the US it really does look like the country is heading for some kind of civil war.
I hope I am wrong about this.
I can see a Presidency with Trump as being very destructive to the institutions built up to protect the democracy, and him attempting to instil himself as President for life. I can see his base to going along with that, but not the vast majority. Which would be the stopper.
Most people who vote, vote the way their parents did, they don't know the issues, they just go on, Party x is bad for us, and Party Y is good, so they vote Y.
What you see here isn't a microcosm of the US, just a few incells who can't get laid in real life, or even in cyber space, now using this as their safe place to vent out the frustration they feel against the changes in society. The white male will soon be in a minority group ( 20 years) a situation made by their own reproductive choices. They feel powerless against this change, and cling to people who tell them, they will fix it back to the way it was.
So if Trump does get reelected but either of the houses stay in a Democratic majority, expect four years of SCOTUS dominating everything. If Trump wins and the Republicans take both houses, expect four years of protests like never seen in the US before. But you won't see a civil war.