Shields of the Republic

The Triumph and Peril of America’s Alliances

Is America’s alliance system so quietly effective that politicians and voters fail to appreciate its importance in delivering the security they take for granted?

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Foreign policy analyses written by CFR fellows and published by the trade presses, academic presses, or the Council on Foreign Relations Press.

For the first century and a half of its existence, the United States had just one alliance―a valuable but highly controversial military arrangement with France. Largely out of deference to George Washington’s warnings against the dangers of “entangling alliances,” subsequent American presidents did not consider entering another until the Second World War. Then everything suddenly changed. Between 1948 and 1955, U.S. leaders extended defensive security guarantees to twenty-three countries in Europe and Asia. Seventy years later, the United States had allied with thirty-seven.

In Shields of the Republic, Mira Rapp-Hooper reveals the remarkable success of America’s unprecedented system of alliances. During the Cold War, a grand strategy focused on allied defense, deterrence, and assurance helped to keep the peace at far lower material and political costs than its critics allege. When the Soviet Union collapsed, however, the United States lost the adversary the system was designed to combat. Its alliances remained without a core strategic logic, leaving them newly vulnerable.

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Today the alliance system is threatened from without and within. China and Russia seek to break the United States’ alliances through conflict and nonmilitary erosion. Meanwhile, U.S. politicians and voters are increasingly skeptical of alliances’ costs and benefits and believe the United States may be better off without them. But what if the alliance system is a victim of its own quiet success? Rapp-Hooper argues that the United States’ national security requires alliances that deter and defend against military and nonmilitary conflict alike. The alliance system is past due for a post–Cold War overhaul, but it remains critical to the country’s safety and prosperity in the twenty-first century.

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Reviews and Endorsements

For seventy years, alliances have been central to American foreign policy. Where did they come from and where are they going? Mira Rapp-Hooper gives smart answers to both the historical and future questions about our alliances.

Joseph S. Nye, Jr., author of Do Morals Matter? Presidents and Foreign Policy from FDR to Trump

Shields of the Republic will stand as the definitive study of U.S. alliances, filling a scholarly gap at a time when America cannot afford to go it alone in an increasingly dangerous world.

Michael J. Green, former Senior Director for Asia, National Security Council

The precarity of America’s alliances is one of the central political issues confronting the United States today. Mira Rapp-Hooper has delivered the essential guide for understanding these complex partnerships. This is a masterful exposition of how alliances can both extend and restrain American power in these transformative times.

Kurt Campbell, cofounder and CEO of the Asia Group and former Assistant Secretary of State for East Asian and Pacific Affairs

Shields of the Republic is a must-read―an invaluable resource for exploring timely and thorny questions about the role of alliances in American foreign policy.

Elizabeth N. Saunders, author of Leaders at War: How Presidents Shape Military Interventions

Rapp-Hooper musters rock-solid evidence to demonstrate what policymakers have long believed: that America’s alliances are a remarkably effective foreign policy tool. Just as importantly, she gives an unambiguous account of why this system must be preserved and lays out a compelling plan for how to do so.

Stephen Hadley, Principal at RiceHadleyGates and former National Security Advisor

Rapp-Hooper argues persuasively that the complex alliance system instituted after the devastation of World War II has proven remarkably successful. . . . A solid argument for the repurposing, reforming, and upgrading of the alliance system.

Kirkus Reviews

Donald Trump’s election in 2016 nurtured a narrative that America’s alliance system was a creaking, doddering structure that costs the United States far more than it delivers. . . . Rapp-Hooper takes a different perspective, viewing the U.S. alliance system as a neglected asset that needs tweaking. She argues that, contrary to the ‘restraint’ school of thought, America’s alliances have augmented U.S. security.

Washington Post

Rapp-Hooper presents a vigorous historical defense of the U.S. alliance system since 1945 that demonstrates how useful alliances have been, even after their vision quest began in 1989. It is a compelling case.

Boston Review

Despite enduring support among the U.S. public for the alliance system, President Donald J. Trump seems determined to upend it, as Mira Rapp-Hooper observes in her astute new book defending U.S. alliances.

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