Why is september 11, 2001, a significant date in us history? al-qaeda carried out the largest terrorist attack against the united states on this date. it is the date that congress passed the patriot act authorizing sweeping surveillance powers. it is the date that the us military launched a “war on terror” in iraq and afghanistan. al-qaeda leader osama bin laden was killed on this date by us military forces.

September 11, 2001, is a significant date in US history because Al-Qaeda carried out the largest terrorist attack against the United States on this date. Option A is correct.

On September 11, 2001, a series of four coordinated terrorist attacks were perpetrated by the Islamic terrorist group al-Qaeda against the United States.

The attacks claimed the lives of 2,996 people, injured over 6,000 others, and caused at least $10 billion in infrastructure and property damage.

Further people died of 9/11-related cancer and respiratory diseases in the months and years after the attacks.

the answer is hope this you.

answer; i believe that the correct answer is (chronological order);