Yes. I would expect that the states in revolt would form armies much like in 1860. Blue urban areas are basically islands. A good strategy would be to surround them and cut off their food, water and power. To speed things up, cities could be fire bombed. In the rear areas, communists would have to be rounded up and eliminated.
No firebombing necessary.
Once you cut off the supply chain/energy of a place with that many people, hell will break loose pretty fast.
If Manhattan was completely cut off from the world, how long could it last?. the island 90% dead within a month.
“Blue urban areas are basically islands”
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These blue areas will marshal their male ovulation into armies to go seize water and electrical production sites as well as transport hubs to ensure their own supply as well as deny them to opposing forces
The coast cities(blue) will switch to foreign supplies of food, energy and weapons from you-know-who and will merciless crush any red states.
Who will aid red states? Yeah, think about that.
Only hope is to seize military instillations and their vast military supplies but even that won’t last long as ammo is used up and industrial production will be nil The suburbs will quickly copulate as they start dying of starvation, dehydration, disease.
The last vestiges of the Republic will die a lonely and miserable death.