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https://www.quora.com/Why-did-Al-Qaeda-attack-the-United-States-on-9-11 Why did Al-Qaeda attack the United States on 9/11? so I typed in this question and these seem to be the most plausible theories.
Osama bin Laden (terrorist) also had a beef with Saudi Arabia itself, declaring "for the Muslim Saudi monarchy to invite non-Muslim American troops to fight against Muslim Iraqi soldiers was a serious violation of Islamic law." (so remember Kuwait? Papa Bush)