Why even consider violent civil war a possible outcome when we can redirect to peaceful separation instead, before more innocent life is lost? Human life is more important than federal supremacy. The adults in the room need to reject the immature tendency towards violence even if we're to decide that we can no longer live together as "one nation".
Splitting up the country to avoid a bloody civil war? Are you serious? The first thing that happens if California secedes is California's ports will be blockaded by US warships. And it's going downhill quickly from there. This administration would love nothing more than justification to lock up every citizen left-of-right-wing, or just exterminate them outright. They have been demonizing liberals for years as child molesters and satanists, casting them as less than human, violent, and depraved. You think a bloodless separation is possible? It's more likely that pigs will sprout wings and fly.