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How the world has changed in the 15 years since 9/11

September 11, 2001 started as a crystal clear morning, but soon turned into one of the country's darkest days. NBC's Harry Smith reports for Sunday TODAY, explaining how the nation has moved forward since the attacks.
/ Source: TODAY

September 11, 2001 started as a crystal clear morning, but soon turned into one of the country’s darkest days. NBC’s Harry Smith reports for Sunday TODAY, explaining how the nation has moved forward since the attacks.