September 11

The September 11 attacks (also referred to as September 11' or 9/11)[nb 1] were a series of four coordinated suicide attacks upon the United States in New York City and the Washington, D.C. areas onSeptember 11, 2001. On that Tuesday morning, 19 terrorists from the Islamist militant group al-Qaeda hijacked four passenger jets. The hijackers intentionally flew two of those planes, AmericanAirlines Flight 11 and United Airlines Flight 175, into the North and South towers of the World Trade Center complex in New York City; both towers collapsed within two hours. The hijackers alsointentionally crashed American Airlines Flight 77 into the Pentagon in Arlington, Virginia, and intended to pilot the fourth hijacked jet, United Airlines Flight 93, into the United States Capitol Building[2] inWashington, D.C.; however, the plane crashed into a field near Shanksville, Pennsylvania, after its passengers attempted to take control of the jet from the hijackers. Nearly 3,000 people died in theattacks, including all 227 civilians and 19 hijackers aboard the four planes.
Suspicion quickly fell on al-Qaeda, and in 2004, the group's leader, Osama bin Laden, who had initially deniedinvolvement, claimed responsibility for the attacks.[1] Al-Qaeda and bin Laden cited U.S. support of Israel, the presence of U.S. troops in Saudi Arabia, and sanctions against Iraq as motives for the attacks.The United States responded to the attacks by launching the War on Terror and invading Afghanistan to depose the Taliban, which had harbored al-Qaeda. Many countries strengthened their anti-terrorismlegislation and expanded law enforcement powers. In May 2011, after years at large, bin Laden was located and killed.
The destruction of the Twin Towers caused serious damage to the economy of LowerManhattan and had a significant impact on global markets. Cleanup of the World Trade Center site was completed in May 2002, and the Pentagon was repaired within a year. Numerous memorials were...