The majority of the population lives in the North East.
Winter would only be the most advantageous time to start a overthrow of America.
Cutting off or controlling the food supply is on the top of the list. Also, shutting down or controlling the Highways and Airports.. including oil/gas flow. Also, shutting down or controlling communication (airways and the internets).
They wouldn’t even have to have complete controll to controll a half asleep mass.
The proud ignorant might even join the revolution.
Cities could go nuts killing and looting at will. Think LA riots times 100? 1,000? 10,000?
Yeah but starve people and the tax base dries up. What do they pay the military with? Sure they can confiscate things and they likely got supplies, but in the end they will just shoot themselves in the foot.
More likely China would see an opportunity to get the debt paid and take the West Coast.