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Security in general was increased greatly to prevent something like 9/11 from ever happening ever again. There were no I.D. requirements and you didn't have to take off your shoes or jackets when going through security. Carry-ons didn't have to be checked and there was no limit on liquids that are carried on the plane.

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Cockpits are now closed and not open to the public because of hijackers.

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The stock market closed for 4 days days after the crash. This was the first time the stock market closed since the Great Depression

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"The airline industry lost $5 billion from the attacks. The four-day shutdown cost $1.4 billion alone. Passengers were afraid of flying for at least a year."

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War in Afghanistan: There were attacks on Al Qaeda and Osama Bin Laden for what happened on 9/11. This was the US's longest military campaign in its history. 111,000 Afghan lives and 2,372 U.S. lives were lost during the war.

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President Bush signed the USA Patriot Act on October 262001. This act improved law enforcement's ability to detect and stop terrorism.

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Oil experienced a huge increase in price. For example, in 2001, a barrel of crude oil cost $21.84 and today the cost is %51.99.

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Illnesses linked to the attacks, including respiratory and digestive diseases, cancers, PTSD and more were common following the attacks.

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Smoke in New York from the crashes

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China and India's economic growth had extremely risen. The European Union was ranked at No. 2, after suffering a collapse (along with the U.S.) during the global economic crisis.

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The approval ratings of George W. Bush increased to 86% after 9/11.

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Days and weeks following the attack on 9/11, overall patriotism and respect increased. Firefighters, president Bush, victims, survivors, and New York City received a lot of respect and sympathy.

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Radio stations did not play content that had anything to do with 9/11; in fact, some of them were banned because they caused pain for people.

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In some shows that take place in New York, they previously showed clips of the New York City skyline with the WTC in it, but following the attacks, they didn't show them anymore.