Cali-Texas and big florida fighting the feds over who gets to be the true Heir of Hitler while the northwest has a Maoist Insurgency lol 
Cali-Texas and big florida fighting the feds over who gets to be the true Heir of Hitler while the northwest has a Maoist Insurgency lol
A generation after the end of the first Civil War the American Empire was sailing ships into Tokyo Bay to force trade concessions, 30 years after the Civil War the American Empire was invading the Philippines and Cuba.
If anything, American society rebuilding itself around militarism instead of treat acquisition, would result in a new dark age, where the American Empire emboldened by the defeat of its domestic enemies would seek to oppress everyone in its reach.
The way I see it the singular problem of nuclear weapons is what makes a Second American Civil War unworkable. It would immediately involve half of the world's armies cooperating with the US Army to secure those nukes.