Timeline of the war in Afghanistan

POSTED: 12:36 PM EDT Jun 18, 2013    UPDATED: 08:13 AM EDT Sep 30, 2014 

A new security agreement keeping U.S. troops in Afghanistan past this year marks yet another chapter in the longest conflict in U.S. history.

Ground Zero 9-11
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Sept. 11, 2001 -- Al-Qaeda operatives hijack four commercial airliners, flying two into New York's World Trade Center and a third into the Pentagon. A fourth plane crashes in a field near the town of Shanksville, Pa., after passengers storm the cockpit. Nearly 3,000 people die in the attacks.

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