This engaging case study approach brings together a diverse set of contributors to help students question motives, consider alternatives, and analyze outcomes in many of the most controversial foreign policy issues now confronting the United States. Many actors―from the president and members of Congress to interest groups, NGOs, and the media―compete to shape U.S. foreign policy. While previous editions of this popular text focused more on national security issues in the wake of 9/11 and the War on Terror, the 13 case studies in this edition deal with a wide range of policy areas: national security, homeland security, diplomacy, trade, immigration, epidemics, climate change, and Russian interference in the 2016 presidential election. Many reflect how the demarcation between foreign and domestic policy has become even more blurred and polarization has come to plays a significantly increased role in American foreign policy.