CRAZY..?
If the people of both coasts like beef, pork, or chicken as part of their diet; then, the heart of the country must continue a grain harvest to feed the livestock. Wish to afford driving an automobile? Without the oil and gas found within the expanse between the coasts, fuel will become an exorbitant luxury. Electricity upon the far shores likewise would be rationed.
The east coast would skirt famine. The west coast would experience balkanized warfare. Flyover country will keep Hank Jr. close to heart, and a rifle behind every blade of grass.
https://www.youtube.com/watch?v=3cQNkIrg-Tk
Those coasts would get mighty hungry.