A Foreign Affairs Best Book of the Year A new history explains how and why, as it prepared to enter World War II, the United States decided to lead the postwar world. For most of its history, the United States avoided making political and military commitments that would entangle it in European-style power politics. Then, suddenly, it conceived a new role for itself as the world’s armed superpower―and never looked back. In Tomorrow, the World, Stephen Wertheim traces America’s transformation to the crucible of World War II, especially in the months prior to the attack on Pearl Harbor. As the Nazis conquered France, the architects of the nation’s new foreign policy came to believe that the United States ought to achieve primacy in international affairs forevermore. Scholars have struggled to explain the decision to pursue global supremacy. Some deny that American elites made a willing choice, casting the United States as a reluctant power that sloughed off “isolationism” only after all potential competitors lay in ruins. Others contend that the United States had always coveted global dominance and realized its ambition at the first opportunity. Both views are wrong. As late as 1940, the small coterie of officials and experts who composed the U.S. foreign policy class either wanted British preeminence in global affairs to continue or hoped that no power would dominate. The war, however, swept away their assumptions, leading them to conclude that the United States should extend its form of law and order across the globe and back it at gunpoint. Wertheim argues that no one favored “isolationism”―a term introduced by advocates of armed supremacy in order to turn their own cause into the definition of a new “internationalism.” We now live, Wertheim warns, in the world that these men created. A sophisticated and impassioned narrative that questions the wisdom of U.S. supremacy, Tomorrow, the World reveals the intellectual path that brought us to today’s global entanglements and endless wars. “You really ought to read it…It is a tour de force…While Wertheim is not the first to expose isolationism as a carefully constructed myth, he does so with devastating effect. Most of all, he helps his readers understand that ‘so long as the phantom of isolationism is held to be the most grievous sin, all is permitted.’” ― Andrew J. Bacevich , The Nation “For almost 80 years now, historians and diplomats have sought not only to describe America’s swift advance to global primacy but also to explain it…Any writer wanting to make a novel contribution either has to have evidence for a new interpretation, or at least be making an older argument in some improved and eye-catching way. Stephen Wertheim’s Tomorrow, the World does both…[An] estimable book.” ― Paul Kennedy , Wall Street Journal “The only recent book to explore U.S. elites’ decision to become the world’s primary power in the early 1940s―a profoundly important choice that has affected the lives of billions of people throughout the globe…Contributes to the effort to transform U.S. foreign policy by giving pro-restraint Americans a usable past. Though Tomorrow, the World is not a polemic, its implications are invigorating…Wertheim opens space for Americans to reexamine their own history and ask themselves whether primacy has ever really met their interests.” ― Daniel Bessner , New Republic “In writing the history of the country’s decision to embrace a militarist vision of world order―and to do so, counterintuitively, through the creation of the United Nations―Wertheim provides an importantly revisionist account of U.S. foreign policy in the 1940s, one that helps us think anew about internationalism today…The contemporary stakes of Wertheim’s work are plainly apparent…A reminder of just how strange it is that Americans have come to see military supremacy as a form of selfless altruism, as a gift to the world.” ― Sam Lebovic , Boston Review “Wertheim delves into an important bit of history to try to pinpoint exactly when and why the United States embraced the global military supremacy that Americans have taken for granted for decades…He is on [firm] ground in arguing that today U.S. global military dominance has outlived its original purpose.” ― Jessica T. Mathews , Foreign Affairs “The Trump and Biden administrations have seen a sharp shift away from the United States’ desire to be the preeminent power in the world. But how did it get there in the first place? In painstaking detail, Wertheim draws the battle map of intellectual warfare that went on during World War II between U.S. thinkers who wanted the United States to continue the tradition of British preeminence and those who didn’t.” ― Jack Detsch , Foreign Policy “Stephen Wertheim isn’t only a great historian of American foreign policy. He uses history to offer a critique of American foreign policy that Americans desperately need now.” ― Peter Beinart, author of The Icarus Syndrome “H