$3 trillion over 15 years.

The most expensive public enemy in American history died Sunday from two bullets. As we mark Osama bin Laden's death, what's striking is how much he cost our nation—and how little we've gained from our fight against him. By conservative estimates, bin Laden cost the United States at least $3 trillion over the past 15 years, counting the disruptions he wrought on the domestic economy, the wars and heightened security triggered by the terrorist attacks he engineered, and the direct efforts to hunt him down.Link