[TTFlyer]

Breakup is inevitable.

[gibsonguy]

Gangrene

[semantic]

I'm surprised at the lack of creativity. Simply have the red states create a 'new USA'. It could be performed via constitutional convention. Make sure to claim title to all federal property within the former USA blue states.

Next day, declare war on the blues. They're defeated without a shot, and then incorporated as territories with limited representation. Problem solved.

This solution also works if states like Calif voted to secede on their own. Same result: military occupation, elimination of representation.