Bin Laden was a religious extremist who was angered by the United States’ support of Israel.
On September 11th, 2001, nineteen men hijacked four commercial airliners and flew them into the World Trade Center towers in New York City and the Pentagon building in Washington D.C. The fourth plane crashed into a field in Pennsylvania after passengers attempted to regain control of the aircraft.
The hijackers were members of al-Qaeda, a terrorist organization led by Osama bin Laden. Bin Laden had been planning an attack on the United States for some time before he carried out 9/11. He believed that the U.S. government was too involved in Middle Eastern affairs and that it supported Israel too much, which made him angry.