Answer:
The September 11, 2001, attacks in the United States were a terrorist act carried out by 19 hijackers of the Salafist organization al-Qaeda. Motives for the attacks were stated before and after the attacks in several sources. Additionally, Osama bin Laden declared a holy war against the United States, and two fatwā were released by bin Laden and others in 1996 and 1998.
In Osama bin Laden's November 2002 "Letter to America", he explicitly stated that al-Qaeda's motives for their attacks include: Western support for attacking Muslims in Somalia, supporting Russian atrocities against Muslims in Chechnya, supporting the Indian oppression against Muslims in Kashmir, the Jewish aggression against Muslims in Lebanon, the presence of US troops in Saudi Arabia, US support of Israel,and sanctions against Iraq.
The U.S. government took the position, as often repeated by the Bush Administration, that terrorists attacked the United States because "they hate us for our freedoms." For example, President George W. Bush in a speech to Congress nine days after the attacks said: "They hate right what we see in this chamber--a democratically elected government. Their leaders are self-appointed. They hate our freedoms--our freedom of religion, our freedom of speech, our freedom to vote and assemble and disagree with each other."
Explanation: I just looked that up:)