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The first Earth Day celebration is held
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The Senate approves the 26th Amendment, that would lower the voting age from 21 to 18
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Walt Disney World opens in Orlando, Florida
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The Watergate crisis begins
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Two defendants in the Watergate break-in trial are convicted
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President Richard M. Nixon resigns as president
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Communist forces complete their takeover of South Vietnam
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Carter wins presidential election against Ford
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The U.S. signs a nuclear proliferation pact
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The United States Senate votes to return the Panama Canal back to Panama on December 31, 1999
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An accident at the Three Mile Island nuclear power plant in Middletown, Pennsylvania occurs when a partial core meltdown is recorded