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Ronald Reagan is inaugurated as the 40th president.
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Space shuttle Challenger explodes 73 seconds after liftoff, killing all seven crew members.
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George H. W. Bush is inaugurated as the 41st president
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A conflict between Iraq and a coalition force of 34 nations mandated by the United Nations and led by the United States.
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Bill Clinton is inaugurated as the 42nd president
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An agreement signed by Canada, Mexico, and the United States, creating a trilateral trade bloc in North America.
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School shooting at Columbine High School leaves 14 students, 1 teacher dead, and 23 others wounded.
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Two hijacked jetliners ram twin towers of World Trade Cente, a third hijacked plane flies into the Pentagon, and a fourth crashes in Pennsylvania.