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https://en.wikipedia.org/wiki/War_in_Afghanistan_%282001%E2%80%9314%29
The War in Afghanistan (or the American war in Afghanistan) is the period in which the United States invaded Afghanistan after the September 11 attacks. Supported initially by close allies, they were later joined by NATO beginning in 2003. It followed the Afghan Civil War's 1996–2001 phase. Its public aims were to dismantle al-Qaeda and to deny it a safe base of operations in Afghanistan by removing the Taliban from power. Key allies, including the United Kingdom, supported the U.S. from the start to the end of the phase. This phase of the War is the longest war in United States history.