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  Mount St. Helens erupted at a high-speed blast leveled millions of trees and ripped soil from bedrock.
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  The Challenger Space Shuttle was a fatal accident in the United States space program. The Space Shuttle Challenger broke apart 73 seconds into its flight.
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  The Cold War came to an end when the last war of Soviet occupation ended in Afghanistan and the Berlin Wall came down in Germany.
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  The 27 amendment prohibited Congress from changing its salary compensation until after the mid-term election.
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  9/11 was a series of four coordinated suicide terrorist attacks carried out by the militant Islamic extremist against the United States.