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Two teenage students murder 13 other students and teachers at Columbine High School. The deadliest mass murder at a high school in U.S. history.
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U.S. prepares for the possible effects of the Y2K bug in computers, which was feared to cause computers to not work anymore causing things to go awry.
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G.W.B. inagurated as 43rd President of the United States
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19 terrorists hijack four planes and crash them into the World Trade Center, the Pentagon, and a field in Shanksville, Pennsylvania killing nearly 3,000 people and injuring over 6,000. All civilian air traffic is suspended for 3 days, the first time an unplanned suspension had occurred in U.S. history.
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Anthrax attacks kill 5 and infect a further 17 through the U.S. Mail system.
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The Department of Homeland Security is created in the wake of the September 11 attacks.
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Former President Saddam Huseein in captured.
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Mark Zuckerberg launches Facebook.
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Barack Hussein Obama II is inaugurated as the 44th President of the United States. He is the first African-American to hold the office.
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Pop icon Michael Jackson dies, creating one of the largest public mournings for an entertainer.
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Osama bin Laden, leader of al-Qaeda and mastermind of the September 11 attacks, is killed in Abbottabad.
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John Holmes kills 12 and injures 58 at a movie theater in Aurora, Colorado.
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A gunman kills 26, including 20 children at the Sandy Hook Elementary School in Newtown, Connecticut.
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Terrorists attack the Boston Marathon by detonating two bombs at the finishing line of the race, killing three and injuring 183 runners and spectators. Suspects Tamerlan and Dzhokhar Tsarnaev then led Boston police on a high-speed chase, killing one officer MIT. Tamerlan was killed in a shoot-out with police and Dzhokhar was detained the day after.