What was the greatest natural disaster in United States history?
Hurricanes, Monsoons, and Tropical Storms
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The greatest natural disaster occurred when a hurricane struck Galveston, Texas, on September 8, 1900, and killed 8,000 to 12,000 people. However, the costliest national disaster to date was Hurricane Katrina, which hit the Gulf Coast in August 2005, killing 1,800 people and causing $100 billion in damages.