A bold and provocative history of the men who fought to outlaw war and how an often overlooked treaty signed in 1928 was among the most transformative events in modern history. ►

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On a hot summer afternoon in 1928, the leaders of the world assembled in Paris to outlaw war. Within the year, the treaty signed that day, known as the Peace Pact, had been ratified by nearly every state in the world. War, for the first time in history, had become illegal the world over. But the promise of that summer day was fleeting. Within a decade of its signing, each state that had gathered in Paris to renounce war was at war. And in the century that followed, the Peace Pact was dismissed as an act of folly and an unmistakable failure. This book argues that that understanding is inaccurate, and that the Peace Pact ushered in a sustained march toward peace that lasts to this day.

The Internationalists tells the story of the Peace Pact by placing it in the long history of international law from the seventeenth century through the present, tracing this rich history through a fascinating and diverse array of lawyers, politicians and intellectuals—Hugo Grotius, Nishi Amane, Salmon Levinson, James Shotwell, Sumner Welles, Carl Schmitt, Hersch Lauterpacht, and Sayyid Qutb. It tells of a centuries-long struggle of ideas over the role of war in a just world order. It details the brutal world of conflict the Peace Pact helped extinguish, and the subsequent era where tariffs and sanctions take the place of tanks and gunships.

The Internationalists examines with renewed appreciation an international system that has outlawed wars of aggression and brought unprecedented stability to the world map. Accessible and gripping, this book will change the way we view the history of the twentieth century—and how we must work together to protect the global order the internationalists fought to make possible.

ADVANCE PRAISE FOR THE INTERNATIONALISTS

“Like The Clash of Civilizations and The End of History, this brilliant book lays out a vision that makes sense of the world today in the context of centuries of history. Hathaway and Shapiro tell their story with literary flair, analytical depth, and historical meticulousness. It will change the way you remember the 20th century and read the news in the 21st.”

—Steven Pinker, Johnstone Professor, Harvard University, and the author of The Better Angels of Our Nature

“Sweeping and yet personable at the same time, The Internationalists explores the profound implications of the outlawry of war. Professors Oona Hathaway and Scott Shapiro enrich their analysis with vignettes of the many individuals (some unknown to most students of History) who played such important roles in this story. None have put it all together in the way that Hathaway and Shapiro have done in this book.”

—Paul Kennedy, Professor of History, Yale University, and author of The Rise and Fall of Great Powers

“The Internationalists, by Yale law school professors Scott Shapiro and Oona Hathaway, is a provocative, fascinating, and significant book. It deserves to be on the bookshelf of all serious students of foreign affairs and promises to rattle conventional wisdom as well as foster a healthy debate.”

—Jay Winik, author of April 1865 and 1944, Historian-in-Residence, Council on Foreign Relations

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HARDCOVER

AUDIO

eBOOK

A bold and provocative history of the men who fought to outlaw war and how an often overlooked treaty signed in 1928 was among the most transformative events in modern history.

On a hot summer afternoon in 1928, the leaders of the world assembled in Paris to outlaw war. Within the year, the treaty signed that day, known as the Peace Pact, had been ratified by nearly every state in the world. War, for the first time in history, had become illegal the world over. But the promise of that summer day was fleeting. Within a decade of its signing, each state that had gathered in Paris to renounce war was at war. And in the century that followed, the Peace Pact was dismissed as an act of folly and an unmistakable failure. This book argues that that understanding is inaccurate, and that the Peace Pact ushered in a sustained march toward peace that lasts to this day.

The Internationalists tells the story of the Peace Pact by placing it in the long history of international law from the seventeenth century through the present, tracing this rich history through a fascinating and diverse array of lawyers, politicians and intellectuals—Hugo Grotius, Nishi Amane, Salmon Levinson, James Shotwell, Sumner Welles, Carl Schmitt, Hersch Lauterpacht, and Sayyid Qutb. It tells of a centuries-long struggle of ideas over the role of war in a just world order. It details the brutal world of conflict the Peace Pact helped extinguish, and the subsequent era where tariffs and sanctions take the place of tanks and gunships.

The Internationalists examines with renewed appreciation an international system that has outlawed wars of aggression and brought unprecedented stability to the world map. Accessible and gripping, this book will change the way we view the history of the twentieth century—and how we must work together to protect the global order the internationalists fought to make possible.