How did the terrorist attacks of 9/11 affect the United States at the dawn of the 21st century? Introduction The 9/11 terrorist attack on US was a series of four suicide attacks by the Islamist militant group, Al-Qaeda. The attack killed nearly 3,000 people and negatively affected the economy of the US. It propagated the US government to launch a war on terror which has also had great economic impact to the US as a whole.

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