Could go that way. Yet there are two countries that will make sure it spreads globally. China and India.
Both have nukes.
Might we see both coasts of this country get nuked? If for food, they simply wont want to destroy the grain belts or food producing areas of this land.
The Reds could invade through the southern boarder through Mexico. Hell, they already have been doing that. Salt enough foreigners within this nation and then start it off.
The invading army is already here, Fast and Furious weapons caches at the ready.........think about it.