September 11 attackshttp://en.wikipedia.org/wiki/
The motives for the attacks include the presence of the U.S. in Saudi Arabia, the support of Israel by the U.S., and the sanctions against Iraq. These motives were explicitly stated by Al-Qaeda in proclamations before the attacks, including the fatwā of August 1996, and a shorter fatwā published in February 1998. After the attacks, bin Laden and al-Zawahiri published additional video tapes and audio tapes, some of which repeated those reasons for the attacks. Two particularly important publications were bin Laden's 2002 "Letter to America", and a 2004 video tape by bin Laden. In addition to direct pronouncements by bin Laden and Al-Qaeda, numerous political analysts have postulated motivations for the attacks.
The continued presence of U.S. troops after the Gulf War in Saudi Arabia was one of the stated motivations behind the September 11th terrorist attacks, the Khobar Towers bombing, as well, the date chosen for the 1998 United States embassy bombings (August 7), was eight years to the day that American troops were sent to Saudi Arabia. Bin Laden interpreted the Prophet Muhammad as banning the "permanent presence of infidels in Arabia". In 1996, Bin Laden issued a fatwā, calling for American troops to get out of Saudi Arabia. In the 1998 fatwā, Al-Qaeda wrote " for over seven years the United States has been occupying the lands of Islam in the holiest of places, the Arabian Peninsula, plundering its riches, dictating to its rulers, humiliating its people, terrorizing its neighbors, and turning its bases in the Peninsula into a spearhead through which to fight the neighboring Muslim peoples." In the December 1999 interview with Rahimullah Yusufzai, bin Laden said he felt that Americans were "too near to Mecca" and considered this a provocation to the entire Muslim world.
In his November 2002 "Letter to America", Bin Laden described the United States' support of Israel as a motivation: "The creation and continuation of Israel is one of the greatest crimes, and you are the leaders of its criminals. And of course there is no need to explain and prove the degree of American support for Israel. The creation of Israel is a crime which must be erased. Each and every person whose hands have become polluted in the contribution towards this crime must pay its price, and pay for it heavily." In 2004 and 2010, Bin Laden again repeated the connection between the September 11 attacks and the support of Israel by the United States. Several analysts, including Mearsheimer and Walt, also claim a motivation for the attacks was the support of Israel by the United States.
In the 1998 fatwā, Al Qaeda identified the Iraq sanctions as a reason to kill Americans: "despite the great devastation inflicted on the Iraqi people by the crusader-Zionist alliance, and despite the huge number of those killed, which has exceeded 1 million... despite all this, the Americans are once against trying to repeat the horrific massacres, as though they are not content with the protracted blockade imposed after the ferocious war or the fragmentation and devastation....On that basis, and in compliance with Allah's order, we issue the following fatwā to all Muslims: The ruling to kill the Americans and their allies—civilians and military—is an individual duty for every Muslim..."
In addition to the motives published by Al Qaeda, analysts have suggested other motives, including humiliation resulting from the Islamic world falling behind the Western world - this discrepancy made especially visible due to recent globalisation. Another speculated motive was the desire to provoke the U.S. into a broader war against the Islamic world, with the hope of motivating more allies to support Al Qaeda.----------------------------