The flashpoint will be an issue one side has designated as "a hill to die on."
For conservatives, it's likely the 2nd Amendment. It could be something else....maybe an assassination and some uncouth movement afterwards.
For liberals, they are already at war with us. That was apparent during the Kavanaugh hearing.
Libs, probably want abortion to be the issue.
If we can repeal off hate crimes laws or get rid of special protected classes and actually treat everyone equal under the law, that would probably trigger them as well.
I feel like we're somewhere between 1916-1917, the eve of the Russian Revolution.
Psychopathic youth forming terrorist/anarchist gangs, frivolous upper & creative class, large restive underclass. The only thing, they won't have the military on their side.
Never in history have a people remained free once they have been disarmed. Never.