US safer 10 years after 9/11, but at what cost?

Tourists flock to Times Square for the bright lights and Broadway shows. There they find another spectacle: helmeted police with machine guns patrolling the subway station on the lookout for would-be bombers and gunmen. Ten years after the Sept. 11 attacks of 2001, the United States has altered the balance between freedom and security, turning an open and casual society into an ever-vigilant one.

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