What Day Was the September 11 attacks?

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Coordinated terrorist attacks using hijacked commercial airliners struck the World Trade Center towers in New York City and the Pentagon near Washington, D.C., with a fourth hijacked plane crashing in a field near Shanksville, Pennsylvania after passengers attempted to retake control.

Nearly 3,000 people died, and the attacks led to major, lasting changes in US national security policy, aviation security, and foreign policy.

The attacks led directly to the creation of the US Department of Homeland Security and the Transportation Security Administration, both established within roughly a year, reshaping airport security procedures worldwide.

The attacks are widely credited with prompting significant changes to how US and allied intelligence agencies share information across agency lines, following criticism that pre-attack warning signs weren't adequately connected beforehand.

The World Trade Center site was later rebuilt with a new tower, One World Trade Center, alongside a memorial and museum dedicated to the victims, completed roughly a decade and a half after the attacks.