Sobald der Supervulkan Yellowstone hochgeht sind die USA Asche. Sie existieren dann nur noch in Geschichtsbüchern. So wie Karthago.
The rest of the planet, and this would especially be true for the northern hemisphere, would experience what is known as a “nuclear winter”. An extreme period of “global cooling” would take place, and temperatures around the world would fall by up to 20 degrees. Crops would fail all over the planet, and severe famine would sweep the globe.