how did america change after 9 11?

How did 9/11 affect American economy?
The most significant economic impact of the 9/11 attacks was how the increased defense spending led to the U.S. debt crisis. Without the War on Terror, the 2020 debt would be $20 trillion or less. That's $26 trillion total debt, at present, minus $6 trillion.
Full answer in: www.thebalance.com
What did the US do after 9 11?
After the September 11, 2001 attacks, the U.S. government responded with immediate action (including rescue operations at the site of the World Trade Center and grounding civilian aircraft), and long-term action, including investigations, legislative changes, military action and restoration projects.
Full answer in: en.wikipedia.org
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What led up to the 9/11 attacks?
The plot. The September 11 attacks were precipitated in large part because Osama bin Laden, the leader of the militant Islamic organization al-Qaeda, held naive beliefs about the United States in the run- up to the attacks.
Full answer in: www.britannica.com
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