This volume explores moral and legal issues relating to sovereignty by addressing foundational questions about its nature, examining state sovereignty between states, and dealing with post 9/11 developments in the U.S., potentially destabilizing received views of democratic sovereignty. With essays addressing foundational, state and international sovereignty, the book focuses on Post 9/11 developments including the profusion of secret national security programs, including those pertaining to the interrogation, rendition, and detention of terror suspects; signal intercepts and meta-data analysis; and targeted killing of irregular militants; prompting questions regarding the legitimacy of executive power in this arena.