As the world shifts away from the unquestioned American hegemony that followed in the wake of the Cold War, the United States is likely to face new kinds of threats and sharper resource constraints than it has in the past. However, the country's alliances, military institutions, and national security strategy have changed little since the Cold War. American foreign and defense policies, therefore, should be assessed for their fitness for achieving sustainable national security amidst the dynamism of the international political economy, changing domestic politics, and even a changing climate.

This book brings together sixteen leading scholars from across political science, history, and political economy to highlight a range of American security considerations that deserve a larger role in both scholarship and strategic decision-making. In these chapters, scholars of political economy and the American defense budget examine the economic engine that underlies U.S. military might and the ways the country deploys these vast (but finite) resources. Historians illuminate how past great powers coped with changing international orders through strategic and institutional innovations. And regional experts assess America's current long-term engagements, from NATO to the chaos of the Middle East to the web of alliances in Asia, deepening understandings that help guard against both costly commitments and short-sighted retrenchments.

This interdisciplinary volume sets an agenda for future scholarship that links politics, economics, and history in pursuit of sustainable security for the United States - and greater peace and stability for Americans and non-Americans alike.

Jeremi Suri holds the Mack Brown Distinguished Chair for Leadership in Global Affairs at the University of Texas at Austin. He is a professor in the University's Department of History and the Lyndon B. Johnson School of Public Affairs. Professor Suri is the author of five books on contemporary politics and foreign policy. In 2007 Smithsonian Magazine named him one of America's "Top Young Innovators" in the Arts and Sciences. His writings appear widely in blogs and print media. Professor Suri is also a frequent public lecturer and guest on radio and television programs.

Benjamin Valentino is an Associate Professor of Government at Dartmouth College. He serves as co-director of the Government Department Honors Program and is the faculty coordinator for the War and Peace Studies Program at the Dickey Center for International Understanding. Professor Valentino's book Final Solutions: Mass Killing and Genocide in the 20th Century received the Edgar S. Furniss Book Award for making an exceptional contribution to the study of national and international security. His work has appeared in outlets including The New York Times, Foreign Affairs, The American Political Science Review, Security Studies, International Organization and The Journal of Politics.