The following statements were NOT effects of the September 11 terrorist attack on the United States:
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Nearly 10,000 people were killed in New York and Washington, D.C. - The actual death toll from the September 11 attacks was around 3,000.
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Al Qaeda established itself as a legitimate state. - Al Qaeda did not establish itself as a state; it remained a terrorist organization.
The other options regarding the Global War on Terror, debates about security versus liberty, and increased security measures related to air travel were indeed effects of the attacks.