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After reading 1909 websites, we found 2 different results for "When the World Trade Center buildings in New York collapsed"
September 11, 2001
On September 11, 2001, World Trade Center buildings 1, 2 and 7 in New York City collapsed as a result of terrorist attacks and the resulting fires.
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in September 2001
After the World Trade Center collapsed in September 2001, the Emmys were postponed twice and actresses and actors were urged to dress in business attire rather than in cleavage-bearing gowns.
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