Approximately 3000 people died in the attacks of September 11, 2001, held by the terrorists.
On September 11. 2001, four terrorists belonging to the al-Qaeda group held attacks at the World Trade Center in New York. The al-Qaeda group was led by Osama bin Laden.
As a result of these attacks, about 3000 innocent people present at the World Trade Center lost their lives and a lot more were severely injured.
Hence, the significance of September 11, 2001, is aforementioned.
Learn more about September 11, 2001, here:
https://brainly.com/question/1297602
#SPJ2