In the wake of the September 11 attacks, Americans were confronted with a new kind of war and a new kind of danger. After the strikes, institutions were created to mobilize the domestic response to potential terrorist threats and Congress passed legislation giving the president broad powers to fight terrorism and to provide heightened security for the nation. In this timely work, a team of experts addresses the question of how a democracy faces the challenge of balancing legitimate homeland security concerns against the rights and freedoms of its citizens. They evaluate the measures introduced in the aftermath of 9/11 and assess the far-reaching consequences of those changes for American politics and society.