“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.
Kurt Schlichter wrote a series of novels about the next civil war. I think you’d like them if you haven’t read them already. He doesn’t think much of the north’s military capability.