September 11 and the War on Terror
On September 11, 2001, al-Qaeda hijackers crashed passenger planes into the World Trade Center and the Pentagon, and a fourth plane crashed in Pennsylvania after passengers resisted, killing nearly 3,000 people in the deadliest terrorist attack in history. In direct response, the United States invaded Afghanistan later that year to target al-Qaeda and remove the Taliban government that had harbored them, the start of what it called the War on Terror; a separate, more contested invasion of Iraq followed in 2003, with lasting effects on global security policy and international relations that continue today.
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