The event - Without warning a powerful earthquake begins to shake Yellowstone Park and within moments huge incandescent hurricanes known as pyroclastic flows, which can cover thousands to tens of thousands of sq km in thick deposits of hot ash, cover the area. No living beings caught in the pyroclastic flow survive. However, these dramatic local effects are not of greatest worldwide concern. Globally, most repercussions come from the effects of the volcanic ash and volcanic gases suddenly released into the atmosphere. America will soon exit the world scene leading to a new world without the US.