Why is september 11, 2001, a significant date in us history?

September 11 mainly referred as 9/11 is the day in which the Islamic terrorist group al-Qaeda hijacked four planes of which two of them were flown into the towers of the World Trade Center present in New York.

Explanation:

Another flight was made to hit the top military building (Pentagon) which was the located in the capital city, Washington DC. They are particularly against the military nearness of these nations in Arab countries. Since the gathering's creation by canister Laden in the late 1980s, Al Qaeda has helped arrange and subsidize various bombings around the world.

The fourth plane was crashed into a field in Shanksville, Pennsylvania. Around 2900 people were killed and over 25000 people were injured due to this deadly attack.

b

explanation:

(1)representation based on state population (2)all states have equal representation apex