What changes have the terrorist attacks on the United States in 2001 and the subsequent attacks in Europe brought to Western societies? In what ways have these events and their aftermath impacted on the relationships between Muslim communities and Western societies? This book explores the remaking of the relationship between Islam and Islamism, on the one hand, and security and securitization, on the other hand, by arguing that 9/11 and its aftermath have led to the opening of a new phase in Western and European history and have remade the relationship between Islam and governmental and societal approaches to security. The authors utilize case studies across the Western world to understand this relationship.