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The United States then launched a “war on terror.” The North Atlantic Treaty Organization supported that effort.

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Soon after the attacks, U.S. President George W. Bush visited the site of the fallen World Trade Center, which became known as “Ground Zero.”

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The loss of life and damage that these hijackings caused form the biggest act of terrorism ever on United States soil.

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These acts of killing were intended to frighten our nation but they have failed. Our country is strong.

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All in all, nearly 3,000 people were killed in the attack, which launched a war in Afghanistan that continued for 13 years.

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Firefighters, police and emergency medics rushed to the scene and many of them were killed when the towers unexpectedly crumbled to the ground.

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Before Bretagne died, the golden retriever received one final salute to honor her hard work as a service dog.Newsela

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Al-Qaida was the group behind the attacks. Run by Osama bin Laden, al-Qaida was a group of Islamic extremists. They say they follow Islam, one of the world's main religions. Islamic extremists like those in al-Qaida believe different things from most Muslims, or people who practice Islam. They use Islam as an excuse to do terrible acts of violence. The religion is peaceful.
Newsela

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Almost 3,000 people were killed during the 9/11 terrorist attacks, which triggered major U.S. initiatives to combat terrorism and defined the presidency of George W. Bush.
Kid Rex

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Rescuers immediately rushed to the sites of the attacks. In New York, more than 400 police officers and firefighters were killed as they searched for survivors. In all, about 2,750 people were killed in New York, 184 at the Pentagon, and 40 in Pennsylvania. All 19 terrorists died. Britannica school

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"Al-Qaeda planned the attacks in advance. Nineteen terrorists boarded the four planes as passengers." Britannica school

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"The attacks were the deadliest terrorist act up to that time. About 3,000 people were killed." Britannica school

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The United States then launched a “war on terror.”

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"The fourth plane crashed in a field in Pennsylvania.The fourth plane probably was heading for the U.S. Capitol. Its passengers and crew fought back against the terrorists, however, and the plane crashed in a field. " Britannica school

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After the September 11 attacks, airport security increased. Passengers and baggage are now screened more thoroughly. In addition, federal air marshals are now assigned to many U.S. flights. These law enforcement officers wear regular clothes and carry hidden weapons. They are trained to protect a plane’s passengers and crew from terrorist threats.
Kid rex

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In October 2001 U.S. and allied forces attacked Afghanistan, where al-Qaeda was based.
Britannica school

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"They used violence to take over the controls. The first two planes hit the two main buildings of the World Trade Center. The buildings were twin towers that were each 110 stories tall." Britannica school

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"The terrorists flew two of the planes into the World Trade Center in New York City." Britannica school

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"On September 11, 2001, members of a terrorist group called al-Qaeda hijacked, or took over, four airplanes in the United States. "   Britannica school

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President George W. Bush gets a standing ovation during his address at the Pentagon memorial service on Oct. 11, 2001, in honor of those who perished in the 9/11 terror attack on the building.
Newsela

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"The third plane was flown into the Pentagon, near Washington, D.C." The third plane destroyed a section of the Pentagon. Britannica school
A third plane hit the Pentagon building just outside Washington, D.C. The Pentagon is the command post for the country's military.
Kid Re