How? If we split by political grouping all the major population centers go Blue everywhere else goes Red? Unless we have a very polite split (unlikely in this case) the Blue side is just signing up to starve to death.
>>seanmc+hh
No there really isn't, especially not in the timeline needed to prevent a city from starving. Seriously New York, Chicago, LA are all 2 weeks of supply chain disruption from foot riots. It takes a nation to supply mega cities like those.