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Hijackers crash two airliners into the World Trade Center in New York City.
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The White House announces that there is "overwhelming evidence" that Osama bin Laden is behind the attacks.
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"Every nation, in every region, now has a decision to make. Either you are with us, or you are with the terrorists. From this day forward, any nation that continues to harbor or support terrorism will be regarded by the United States as a hostile regime."
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The U.S. begins bombing Afghanistan
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Here is a good video of what all happen to the World Trade Center on September 11, 2001
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Osama bin Laden is dead
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About 9,800 American troops will stay in Afghanistan in 2015 -- down from 38,000 at the start of 2014.