9/11.... has it been the biggest tragedy in the history of America ?

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people may be anware of google facebook or yahoo, the top internet site. But when you ask about 9/11 i dont thing anybody in the whole world would say "I dont know" In the recent time i beleive it has been the biggest tragedy for America it has made america think again about the strength of terror. It has been an issue for ecpert to evaluate whether this has been the biggest tragedy of America