One World, Rival Theories

he U.S. government has endured several painful rounds of scrutiny as it tries to figure out what went wrong on Sept. 11, 2001. The intelligence community faces radical restructuring; the military has made a sharp pivot to face a new enemy; and a vast new federal agency has blossomed to coordinate homeland security. But did September 11 signal a failure of theory on par with the failures of intelligence and policy? Familiar theories about how the world works still dominate academic debate. Instead of radical