The shocking attacks of September 11, 2001, were one of those "wake up" moments for the US, raising troubling questions about the nation's place in the world, how it could defend itself and what kind of a country it wanted to be. Looking back with Adam at how 9/11 changed America are Prof Nazita Lajevardi (Michigan State and Oxford), an expert in the experiences of the Muslim American community, and Prof Peter Feaver (Duke), who worked on the national security council staff in the Bush White House.