September 11, 2001

The Attacks

On September 11, 2001, nineteen al-Qaeda terrorists hijacked four commercial aircraft in the United States. Two struck the World Trade Center towers in New York, which subsequently collapsed, and a third struck the Pentagon in Arlington, Virginia. Passengers resisted the hijackers on United Airlines Flight 93, which crashed in Pennsylvania before reaching its intended target in Washington. The attacks killed 2,977 people, excluding the hijackers, from ninety countries. [1]

Al-Qaeda operated from Afghanistan under the protection of the Taliban. Led by Osama bin Laden, al-Qaeda had already attacked American targets, including the embassies in Kenya and Tanzania in 1998 and the USS Cole in 2000. The September 11 plot exploited failures to share intelligence, track known operatives, and prepare aviation defenses for suicide hijackings. The bipartisan 9/11 Commission later identified failures across several agencies and administrations, rather than attributing the disaster to a single missed warning. [2]

Diplomacy and War

NATO responded by invoking Article 5 of the North Atlantic Treaty for the first time. Its September 12 decision was conditional on confirming that the attacks had been directed from abroad; the North Atlantic Council made that determination on October 2. Allied assistance included aircraft patrolling American airspace, intelligence cooperation, and naval patrols in the Mediterranean. Australia also invoked the ANZUS Treaty, joining the international effort to support the United States. [3] [4]

Congress authorized the use of military force against those responsible for the attacks and those who harbored them; George W. Bush signed the resolution on September 18. After the Taliban failed to meet American demands to surrender al-Qaeda leaders and close their camps, the United States began military operations in Afghanistan on October 7. The authorization’s language concerning organizations, individuals, and harboring states helped shape the subsequent counterterrorism campaign. [5] [1]

Security at Home

The USA PATRIOT Act, enacted in October 2001, expanded surveillance and investigatory authorities and strengthened measures against terrorist financing. In November 2002, legislation created the Department of Homeland Security, combining twenty-two federal agencies and programs. The reorganization brought border, transportation, emergency management, and other functions into a new department, while intelligence coordination and the protection of civil liberties remained subjects of public policy and congressional oversight. [6] [7] [2]

The immediate victims included people at work, airline passengers and crews, and emergency responders. Rescue and recovery continued for months. Exposure to the dust and debris produced lasting illnesses among responders and survivors, extending the human consequences beyond the deaths recorded on the day of the attacks. [1]

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