In which year did the tragedy known as "9/11" happen?
in 1911
in 1991
in 2001
in 2011 
The September 11 attacks (also referred to as 9/11) were a series of four coordinated terrorist attacks by the Islamic terrorist group al-Qaeda on the United States on the morning of Tuesday, September 11, 2001. The attacks killed 2,996 people, injured over 6,000 others, and caused at least $10 billion in infrastructure and property damage.
reach: rather globaldisastershistoryNew YorkTerrorismthe United StatesUnited States
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in 1911
in 1991
in 2001
in 2011 
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