Final answer:
The 9/11 Attacks occurred in the 2000s CE, specifically on September 11, 2001. They were a series of coordinated terrorist acts carried out by al-Qaeda in the United States.
Step-by-step explanation:
The 9/11 Attacks took place in the 2000s CE. Specifically, the attacks occurred on September 11, 2001. These attacks were a series of coordinated terrorist acts carried out by the extremist group, al-Qaeda, on the United States. The attacks involved four planes being hijacked, resulting in the destruction of the Twin Towers in New York City, damage to the Pentagon in Washington D.C., and a crashed plane in Pennsylvania.
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