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Mount St. Helens erupted on May 18, 1980, becoming the United States' greatest and most devastating volcanic eruption.
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Sandra Day O'Connor becomes the first female member of the United States Supreme Court on September 25, 1981.
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Explosion of the Challenger Video from CNN The space shuttle Challenger exploded during takeoff on January 28, 1986, killing everyone on board.
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The tax code has been simplified, and the tax base has been expanded. On October 22, 1986, it was dubbed "Reagan tax cuts."
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On October 19, 1987 the New York Stock Exchange had a stock market catastrophe known as Black Monday.
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George W. Bush becomes the 41st President of the United States on January 20, 1989.
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The 27th Amendment was ratified on May 7, 1992. The United States Congress is prohibited from giving itself a midterm or retroactive salary hike under this Amendment.
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In the United States, this is the fourth deadliest school shooting in history. 14 students and one teacher were killed at Columbine High School in Littleton, Colorado, along with two shooters and 23 others.
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Two planes attack the World Trade Center, destroying it, while one plane crashes into the Pentagon in Arlington, Virginia, killing more than 3,000 people.