A Suggestion for Hollywood
If you want to make a movie about an America-destroying catastrophe, I recommend one about the next eruption of the Yellowstone Caldera. According to Wikipedia:
A full-scale eruption of the Yellowstone supervolcano could result in millions of deaths locally and catastrophic climactic effects globally.The University of Wisconsin has a map showing the predicted area of destruction. You could make the movie based on real science instead of the imaginary science “The Day after Tomorrow” is based on.
Digression: How reliable is Wikipedia anyway? It might be possible for a gang of loons to invade on an obscure issue or two and set themselves up as the Real Authorities and convince outsiders that anybody who disagrees is a kook.