A second US Civil War?
I'm not all that impressed with ANTIFA. This looks like a replay of the sixties, but not the eighteen-sixties.
Yes, they're violent extremists. But they don't have what it takes to pull off a forceful overthrow of the government. It's more of an extreme form of acting out. These are mostly entitled white assholes with way too much self esteem for their own good, and delusions of Bolshevism. Shoot a few, throw the rest in prison, and it'll be over. At least for another fifty years or so.
Now the Trumpistas... if you want to compare them to the Confederates, you're on firmer ground. Or if you dare, to the American Revolutionaries.