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NEW YORK - SEPTEMBER 11, 2001:  (SEPTEMBER 11 RETROSPECTIVE) Smoke pours from the twin towers of the World Trade Center after they were hit by two hijacked airliners in a terrorist attack September 11, 2001 in New York City.  (Photo by Robert Giroux/Getty Images)
NEW YORK - SEPTEMBER 11, 2001:  (SEPTEMBER 11 RETROSPECTIVE) Smoke pours from the twin towers of the World Trade Center after they were hit by two hijacked airliners in a terrorist attack September 11, 2001 in New York City.  (Photo by Robert Giroux/Getty Images)

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Una lista de los atentados más notables en la historia reciente de Estados Unidos.