Answer:
Al Qaeda
Step-by-step explanation:
It was on September 11, 2001. This group hijacked four airplanes and carried out attacks against targets in the United States. Two of the planes were flown into the twin towers of the World Trade Center in New York City, a third plane hit the Pentagon just outside Washington, D.C., and the fourth plane crashed in a field in Shanksville, Pennsylvania. This was one of the biggest terrorist attacks the US has ever had. There were a total of 3,000 people who died on that day.
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*** They would not let me say certain words so if you are looking for certain words then feel free to look it up also!