More than likely - a civil war will more closely resemble a revolution.s
Civil war is a two way street for sure. And if your neighbor wants a war, you either get a war or get a bullet in the neck. But...
There isn't really consensus as to what causes Civil Wars, but looking at it from inside the ramp up I can tell you that arrogant government officials combined with narcissistic assholes who feel that profitability and power for themselves are going to flow like water are a pretty big part of it.
In regular government, we pick our leaders by voting for them. In a post Civil-War government, we pick them by elevating the most brutal among us to the highest chairs.
When it starts I know it's time to slip the American dream into the dirt, not go have a party because she's dead. With the UN, Globalism, China, the Surveillance State etc...no nation on our planet is likely to ever look like Freedom Era America ever again. And I for one am going to be sad to see her go, not cheering that shit on some Internet forum.
Parts of our governments (Fed, State, County, City) will side with the tyrants. Other parts will side with those who oppose this tyranny. Citizens who oppose this tyranny will be branded "Domestic Terrorists" whether they only sent emails to show their "resistance" or whether they took up arms, or just voted for "the other guy". The government controlled media propaganda outlets will be pushing that narrative hard.
Obviously the tyrants in these governments will try to use whatever resources, equipment, and troops they command to remain in power and enforce their brand of tyranny. It will be up to the individuals in those forces themselves to decide whether to side with tyrants or citizens.
In any event - if it starts, every pension, savings account, stock portfolio or retirement account is history. If you don't have something in your hands right now? You won't be getting it in the future. This - if it happens - will be the end of the USA that we've known in our lifetimes.
And to state the obvious.... NO, I DO NOT WANT A WAR OF ANY SORT.