May 26, 2014 Superpowers Don't Get to Retire What our tired country still owes the world By Robert Kagan I

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Foreign Policy

May 26, 2014

Superpowers Don't Get to Retire

What our tired country still owes the world

By Robert Kagan


Almost 70 years ago, a new world order was born from the rubble of World War II, built by and around the power of the United States. Today that world order shows signs of cracking, and perhaps even collapsing. The Russia-Ukraine and Syria crises, and the world’s tepid response, the general upheaval in the greater Middle East and North Africa, the growing nationalist and great-power tensions in East Asia, the worldwide advance of autocracy and retreat of democracy—taken individually, these problems are neither unprecedented nor unmanageable. But collectively they are a sign that something is changing, and perhaps more quickly than we may imagine. They may signal a transition into a different world order or into a world disorder of a kind not seen since the 1930s. 

If a breakdown in the world order that America made is occurring, it is not because America’s power is declining—America’s wealth, power, and potential influence remain adequate to meet the present challenges. It is not because the world has become more complex and intractable—the world has always been complex and intractable. And it is not simply war-weariness. Strangely enough, it is an intellectual problem, a question of identity and purpose. 

Many Americans and their political leaders in both parties, including President Obama, have either forgotten or rejected the assumptions that undergirded American foreign policy for the past seven decades. In particular, American foreign policy may be moving away from the sense of global responsibility that equated American interests with the interests of many others around the world and back toward the defense of narrower, more parochial national interests. This is sometimes called “isolationism,” but that is not the right word. It may be more correctly described as a search for normalcy. At the core of American unease is a desire to shed the unusual burdens of responsibility that previous generations of Americans took on in World War II and throughout the cold war and to return to being a more normal kind of nation, more attuned to its own needs and less to those of the wider world. 

If this is indeed what a majority of Americans seek today, then the current period of retrenchment will not be a temporary pause before an inevitable return to global activism. It will mark a new phase in the evolution of America’s foreign policy. And because America’s role in shaping the world order has been so unusually powerful and pervasive, it will also begin a new phase in the international system, one that promises not to be marginally different but radically different from what we have known these past 70 years. Unless Americans can be led back to an understanding of their enlightened self-interest, to see again how their fate is entangled with that of the world, then the prospects for a peaceful twenty-first century in which Americans and American principles can thrive will be bleak.


To understand where America, and the world, may be heading, it is useful to remind ourselves where we have been—of the choices that Americans made decades ago and of the profound, world-changing consequences of those choices. 

For Americans, the choice was never been between isolationism and internationalism. With their acquisitive drive for wealth and happiness, their love of commerce, their economic and (in earlier times) territorial expansiveness, and their universalistic ideology, they never had it in them to wall themselves off from the rest of the world. Tokugawa Japan and Ming China were isolationist. Americans have always been more like republican Rome or ancient Athens, a people and a nation on the move.

When, roughly 70 years ago, American foreign policy underwent a revolutionary transformation, it was not a transformation from isolationism to internationalism. What Americans had rejected before World War II was a steady global involvement, with commitments to other nations and responsibilities for the general well-being of the world. That was what the so-called “internationalists” of the time wanted for the United States. Theodore Roosevelt, John Hay, Henry Cabot Lodge, Elihu Root, Henry Stimson, Woodrow Wilson, and many others believed that Americans ought to take on a much bigger role in world affairs, as befitted their growing power. The United States had become “more and more the balance of power of the whole globe,” Roosevelt observed, and it ought to behave accordingly. And indeed, following the Spanish-American War and for the first two decades of the twentieth century, the United States did pursue a wider and deeper global involvement than it had ever done before, culminating in the dispatch of two million troops to France. When World War I ended, Wilson, like Roosevelt before him, ambitiously set out to make the United States a central player in world affairs. Beseeched by all the European powers after the war—for American financing aid to steady their economies and for American security guarantees against each other—Wilson wanted the United States to commit itself to an enduring global role. The world, he warned Americans, would be “absolutely in despair if America deserts it.” Wilson’s League of Nations (actually it had been Roosevelt’s idea first), although couched in the idealistic language of universal principles and collective security, was meant above all to serve as the vehicle for American power and influence in support of a new liberal world order. 

But Americans rejected this role. Disillusioned by the compromises and imperfections of the Versailles Treaty, mourning the loss of more than 100,000 dead soldiers, skeptical about American participation in the league, and spurred on by Republicans eager to defeat Wilson and recapture the White House, a majority of Americans came to oppose not only the league but also the internationalists’ broad vision of America’s global role. This was no absentminded lapse back into nonexistent isolationist traditions. It was a deliberate decision to turn away from the increasingly active global involvement of the previous two decades, to adopt a foreign policy of far greater restraint, and above all to avoid future military interventions beyond the Western Hemisphere. Wilson’s Republican successors promised, and the American public welcomed, what Warren Harding called a “return to normalcy.” 

Normalcy in the 1920s did not mean isolation. Americans continued to trade, to invest, and to travel overseas; their navy was equaled in size only by Britain’s, and had fleets in the Atlantic and the Pacific; and their diplomats pursued treaties to control the arms race and to “outlaw” war. Normalcy simply meant defining America’s national interests the way most other nations defined theirs. It meant defending the homeland, avoiding overseas commitments, preserving the country’s independence and freedom of action, and creating prosperity at home. The problems of Europe and Asia were not America’s problems, and they could be solved, or not solved, without American help. This applied to global economic issues as well. Harding wanted to “prosper America first,” and he did. The 1920s were boom years for the American economy, while Europe’s postwar economies stagnated. 

To the vast majority of Americans, normalcy seemed a reasonable response to the world of the 1920s, after the enormous exertions of the Wilson years. There were no obvious threats on the horizon. Postwar Weimar Germany was a faltering republic more likely to collapse than to take another stab at continental dominance. Bolshevik Russia was wracked by civil war and economic crisis. Japan, though growing in power and ambition, was a fragile democracy with a seat on the League of Nations permanent council. To most Americans in the 1920s, the greatest risk to America came not from foreign powers but from those misguided “internationalists” and the greedy bankers and war profiteers who would involve the nation in foreign conflicts that were none of America’s business. 

This consensus was broad, deep, and bipartisan, and Americans stayed on the course of normalcy for two full decades. They did so even as the world order—no longer upheld by the old combination of British naval might and a relatively stable balance of power in Europe and Asia—began to fray and then collapse. The Japanese invasion of Manchuria in 1931; Hitler’s rise to power in 1933; Mussolini’s invasion of Ethiopia in 1935; Germany’s remilitarization of the Rhineland, and the German and Italian intervention in the Spanish Civil War, in 1936; Japan’s invasion of central China in 1937; Hitler’s absorption of Austria, followed by his annexation and eventual conquest of Czechoslovakia in 1938 and 1939—all these events troubled and at times appalled Americans. They were not ignorant of what was going on. Even back then information traveled widely and rapidly, and the newspapers and newsreels were filled with stories about each unfolding crisis. Reports of Mussolini’s dive-bombers dropping their ordnance on spear-carrying Ethiopians; Germany’s aerial bombing of the civilian population of Guernica; Japan’s rampage of rape, pillage, and murder in Nanking—they were horrific and regrettable. But they were not reasons for the United States to get involved. On the contrary, they were reasons for not getting involved. The worse things looked around the world, the more hopeless it all seemed, the less Americans wanted to have anything to do with it. The United States, it was widely believed, had no vital interests at stake in Manchuria, Ethiopia, Spain, or Czechoslovakia.

In fact, it was not clear that the United States had vital interests anywhere outside the Western Hemisphere. Even after the German invasion of Poland in 1939, and the outbreak of a general European war that followed, respected American strategic thinkers, priding themselves on “realistic thinking,” the “banishment of altruism and sentiment” from their analysis, and “single-minded attention to the national interests,” advised that, with two oceans and a strong navy standing between America and every great power in the world, the United States was invulnerable.A Japanese attack on, say, Hawaii, they ruled out as literally impossible. Republican Senator Robert A. Taft felt confident in saying that no power “would be stupid enough” to attack the United States “from across thousands of miles of ocean.” Nor would the United States suffer appreciably if Nazi Germany did manage to conquer all of Europe, including Great Britain, which by 1940 the realists regarded as a foregone conclusion. Taft saw no reason why the United States could not trade and conduct normal diplomacy with a Europe dominated by Nazi Germany just as it had with Great Britain and France. As the historian Howard K. Beale put it, nations “do not trade with one another because they like each other’s governments but because both sides find the exchange of goods desirable.”

Holders of such views were tagged with the disparaging label of “isolationist,” but as Hans Morgenthau later pointed out, they believed at the time that they were upholding the “realist tradition of American foreign policy.” The United States should not range “over the world like a knight-errant,” Taft admonished, “[protecting] democracy and ideals of good faith and [tilting] like Don Quixote against the windmills of fascism.” Taft insisted on seeing the world as it was, not as idealists wished it to be. The European war was the product of “national and racial animosities” that had existed “for centuries” and would continue to exist “for centuries to come,” he argued. To make a difference in the war, the United States would have to send millions of troops across the ocean, make an impossible amphibious landing on shores heavily defended by German forces, and then march across Europe against the world’s strongest army. The very thought was inconceivable. Much as they might wish to help Europe, therefore, Americans had “no power, even if we have the will, to be its savior.” 

This view was so dominant and so politically popular that Franklin Roosevelt spent his first years in office muzzling his internationalist instincts and vowing to keep America out of another war—“I hate war!” he roared in a famous address in 1936. After Munich, however, he grew panicked, sensing that the Western powers, Britain and France, had lost the will to stand up to Hitler. And so he began trying to warn Americans of what he regarded as the coming threat. Yet it was difficult to counter the realists’ hardheaded analysis. Roosevelt could not prove that American security was directly endangered by what was happening in Europe. He was left making a case that really did appeal more to sentiment and idealism than to demonstrable threats to the American homeland.

Even if the United States faced no immediate danger of military attack, Roosevelt argued, if Hitler, Mussolini, and Imperial Japan were allowed to have their way, the world would be a “shabby and dangerous place to live in—yes, even for Americans to live in.” America would become a “lone island” in a world dominated by the “philosophy of force.” The “institutions of democracy” would be placed at risk even if America’s security was not, because America would have to become an armed camp to defend itself. Roosevelt urged Americans to look beyond their immediate physical security. “There comes a time in the affairs of men,” he said, “when they must prepare to defend, not their homes alone, but the tenets of faith and humanity on which their churches, their governments, and their very civilization are founded. The defense of religion, of democracy, and of good faith among nations is all the same fight. To save one we must now make up our minds to save all.”

Such arguments, along with the fall of France and the Battle of Britain, did help convince Americans that they had a stake in the outcome of the European struggle, but it did not convince them to go to war. That decision followed only after Pearl Harbor. The Japanese attack, Hitler’s subsequent declaration of war, and America’s full-scale entry into the conflicts in both Europe and Asia were a traumatic shock to Americans, especially for those in positions of power. That which had been deemed impossible had proved possible, and long-held assumptions about American security in a troubled world collapsed in a single day. 


The events of 1941 forced a fundamental reassessment not only of America’s global strategy but also of how to define America’s interests. Even as they waged the struggle against Germany and Japan, Roosevelt and his advisers during the war began thinking of how the postwar world ought to be shaped, and they took as their guide what they considered the lessons of the previous two decades. 

The first had to do with security. The Japanese attack had proved that vast oceans and even a strong navy no longer provided adequate defense against attack. More broadly, there was the realization—or rather the rediscovery—of an old understanding: that the rise of a hostile hegemonic power on the Eurasian landmass could eventually threaten America’s core security interests as well as its economic well-being. As a corollary, there was the “lesson of Munich”: would-be aggressors in Eurasia had to be deterred before they became too strong to be stopped short of all-out war.

Another lesson was that the United States had an interest in political developments in Eurasia. Walter Lippmann argued that, for Americans to enjoy both “physical security” and the preservation of their “free way of life,” they had to ensure that “the other shore of the Atlantic” remained always in the hands of “friendly,” “trustworthy” democracies. For two decades, people had sneered at “Woodrow Wilson’s demand that the world must be made safe for democracy,” Lippmann commented, but Wilson had been right. Under the control of “free governments the shores and waters of the Atlantic” had become the “geographical center of human liberty.” The Atlantic Charter and Roosevelt’s Four Freedoms reflected this revived conviction that the well-being of democracy in the world was not only desirable but important to America’s security. 

Henry Kissinger championed a “concert” of nations poised in rough equilibrium. 

Then there was the global economy. In the late 1920s and throughout the 1930s, the United States had sought mostly domestic remedies for the Great Depression, raising its own tariffs, choking off lending abroad, refusing to join other nations in a common monetary policy, and generally protecting the American economy while ignoring the world economy. By 1941, however, Roosevelt and his advisers had concluded that both America’s prosperity and its security depended on a healthy world economy. Poverty and economic dislocation had played a major role in the rise of both Hitler and Bolshevism. The United States bore much of the blame, for although it had been the world’s leading economic power in the 1920s and 1930s, it had failed to play a constructive and responsible role in stabilizing the global economy. 

Finally, there was the issue of American public support for global involvement. In the 1920s and 1930s, Americans had been allowed and even encouraged by their political leaders to believe that the United States was immune to the world’s troubles. They could not be allowed to fall back into such complacency. They could no longer regard events thousands of miles away as of no concern to them. To Roosevelt, assuring public support for a larger and more consistent American role in the world was going to be among the greatest challenges after the war. Americans had to understand, as Reinhold Niebuhr wrote in April 1943, that “the world problem cannot be solved if America does not accept its full share of responsibility in solving it.” 

That share was to be sizeable. convinced that World War II had been the result not of any single incident but rather of the overall breakdown of world order, politically, economically, and strategically, American leaders set out to erect and sustain a new order that could endure. This time it was to be a world order built around American economic, political, and military power. Europeans had proved incapable of keeping the peace. Asia was entirely unstable on its own. Any new order would depend on the United States. It would become the center of a new economic system that would encourage open trade and provide financial assistance and loans to nations struggling to stay afloat. It would take a substantial and active part in the occupation and transformation of the defeated powers, ensuring that some form of democracy took root in place of the dictatorships that had led those nations to war. America would also have to possess preponderant military strength and when necessary deploy sufficient power to preserve stability and security in Europe, Asia, and the Middle East.

Military force played a central part in the calculations of Roosevelt and his advisers as they set out to establish and defend the new liberal world order. “Peace must be kept by force,” Roosevelt insisted. There was “no other way.” He anticipated that an American occupation force of one million troops would be necessary to keep the peace in Europe, for at least a year and perhaps longer. During the war, the Joint Chiefs envisioned establishing military bases around the world in “areas well removed from the United States” so that any fighting would take place “nearer the enemy” rather than near American territory. 

Roosevelt naturally hoped to avoid the repeated and extended deployment of American ground forces overseas, since he feared the public would not tolerate it. But he did expect that the United States would have to send at least planes and ships whenever called upon by the U.N. Security Council. As Cordell Hull insisted at the Dumbarton Oaks conference in 1944, American military forces had to be “available promptly, in adequate measure, and with certainty.” In fact, Roosevelt anticipated that requests from the Security Council would be so frequent that he did not want the president to have to go to Congress each time for approval of the use of force. The Security Council had to have “the power to act quickly and decisively to keep the peace by force, if necessary,” Roosevelt explained, and so the American representative had to be given advance authority to act. 

Roosevelt supported the United Nations but was not a great believer in collective security. American power, he believed, would be the key. He saw the United Nations much as Wilson had seen the League of Nations, as a vehicle for U.S. global involvement. Indeed, as the historian Robert Dallek has noted, for Roosevelt the United Nations was partly meant to “obscure” the central role American power was to play in the new world order— obscure it, that is, from Americans. 


This new American grand strategy for the postwar world could not have been a more radical departure from “normalcy.” Its goals were not simply defense of the territory, prosperity, and sovereign independence of the American people, but also the promotion of a liberal world order that would defend not only America’s interests but those of many other nations as well. The rise of a Eurasian hegemon would threaten other nations long before it would threaten the United States, for instance, yet Americans now accepted primary responsibility for preventing it. The new strategy was not selfless or altruistic. American officials believed that it was in the best interest of the United States. But neither did it fit the normal definition of the “national interest.” As Dean Acheson explained, Americans had to learn to “operate in a pattern of responsibility which is greater than our own interests.” This was the real revolution in American foreign policy.

The new strategy was not directed at any particular nation or any specific threat—at least not at first. The Soviet Union had not yet emerged as the next great challenge to the new global order. During World War II, Roosevelt and most other top officials expected mutual cooperation with the Soviets after the war, and even as late as 1945, Acheson still believed in the possibility of partnership with Moscow. Rather than responding to a specific threat, the new grand strategy aimed at preventing a general collapse of global order, which meant supporting an open international economic system, enforcing principles of international behavior, supporting, where possible, democratic governments, encouraging a minimum of respect for human rights, as defined in the U.N. Charter, and generally promoting the kind of world that suited Americans and those who shared their beliefs. 

This new and wide-ranging set of goals and responsibilities completely reoriented the posture of American foreign policy. Instead of essentially leaning back, waiting for threats to emerge, responding, and then pulling back again, the new strategy required a constant and pervasive forward involvement in the affairs of the world. The new economic strategy aimed to prevent economic crises before they resulted in revolution or despotism. The new military strategy aimed to discourage would-be aggressors before they became aggressors, or as Roosevelt put it, to “end future wars by stepping on their necks before they grow up.” 

The new forward-leaning posture became especially pronounced as the postwar era transitioned into the cold war. The Marshall Plan aimed to shore up Western European economies and democracies before they collapsed and succumbed to communism. The Truman Doctrine aimed to bolster Greece and Turkey before they fell to communist subversion. When the communist revolution triumphed in China in 1949, American critics blamed the Truman administration for not doing enough to prevent it—a charge, fair or not, that no one would have thought to make before World War II. The unanticipated North Korean invasion of the South produced panic in Washington and, in the minds of Truman and his advisers, powerfully reinforced the “lesson of Munich.” Henceforth the United States would have to be vigilant and ready to act, with force, anywhere in the world.

All of this was precisely what the anti-interventionist critics had warned about in the 1930s. Taft, a thoughtful and intelligent man, had indeed predicted that, once sent off to the war, American forces would never come home again. Victory would prove as much a curse as a blessing. American troops, Taft had warned, “would have to police Europe or maintain the balance of power there by force of arms” indefinitely. Beale had cautioned that, if freedom and democracy were the goals, as Roosevelt claimed, then the United States was going to have to “maintain democracy by armed force on the Continent of Europe” and keep a “navy large enough to establish ‘freedom of the seas’ ... on all the oceans of the world.” It was a prescription at once for bankruptcy and militarism at home and “unadulterated imperialism” abroad. 

Roosevelt and other American statesmen originally hoped that the United States would not have to do everything by itself. Roosevelt planned to share global management among the “Four Policemen”—the United States, Great Britain, the Soviet Union, and China. And Truman in 1945 was bound and determined to slash the defense budget and bring as many troops home as possible. Yet within two years after the war ended, the new world order was already teetering on the edge of collapse along with hopes for global partnership with the other great powers. Britain quickly signaled its inability to play its historic role, even in the Mediterranean. China descended into civil war and revolution. And the Soviet Union emerged not as a supporter of the new order but, to American eyes, as its greatest opponent. The result was the disheartening realization that the United States was going to carry the lion’s share of the burden, just as Taft had warned. As Acheson later put it, the United States was going to have to be “the locomotive at the head of mankind,” while the rest of the world was going to be “the caboose.”

Roosevelt had always worried that the American people would never accept such an expansive and seemingly open-ended global role. Three months before he died, in his last State of the Union address, in January 1945, he attempted to rally them for the task ahead. “In our disillusionment after the last war,” he reminded the American public, “we gave up the hope of gradually achieving a better peace because we had not the courage to fulfill our responsibilities in an admittedly imperfect world. We must not let that happen again, or we shall follow the same tragic road again—the road to a third world war.”


That was the last time, before 1989, that an American statesman would think of American global responsibilities without reference to the Soviet Union or to international communism. The onset of the cold war, the panicked American response to Soviet policies in Eastern Europe and in the Middle East, and the recurrent American paranoia about the danger of communist subversion at home answered FDR’s fears about public support. To many Americans, Soviet communism seemed an even more direct threat to their way of life than Hitler and the Nazis. Fighting it, therefore, proved an easier strategy to comprehend and support than shouldering “responsibilities in an admittedly imperfect world.” Although there was intense and often divisive debate over foreign policy during the cold war, and much dissent voiced by critics of anti-communist containment, especially during and just after the Vietnam war, a majority of Americans proved consistently willing to go to great lengths in the name of containing communism. In the late 1940s and 1950s, they provided billions of dollars for European reconstruction and made military alliances with former adversaries such as Japan and Germany and other European powers they had once disdained and mistrusted. They even extended nuclear guarantees to deter a Soviet conventional invasion of Europe, voluntarily making themselves targets of Soviet nuclear weapons in the event of a European war. In the 1950s and 1960s, they often spent 10 percent or more of their GDP on defense. They deployed hundreds of thousands of troops overseas, indefinitely, in Europe and Asia—almost a million during the Eisenhower years. They fought in costly wars in Korea and Vietnam, with uncertain and unsatisfying results.

Justifying everything in terms of the anti-communist struggle may have been, to borrow Acheson’s phrase, “clearer than truth,” but it worked. Fear of communism, combined with fear of the Soviet Union as a geopolitical threat, allowed a majority of Americans and American policymakers to view practically any policy directed against communist forces, or even against suspected communist forces, anywhere in the world as directly serving the nation’s vital interests. In 1965, even David Halberstam believed that preventing a communist victory in Vietnam was “vital to our national interest.” A decade and a half later, Jimmy Carter, who had come to office warning, not entirely unreasonably, against an “inordinate fear of communism,” was forced to announce a dramatic shift of policy in response to a Soviet invasion of Afghanistan, a country that not two Americans in a million could have found on a map and where no direct American interest could be identified, other than the fact that the Soviets were there. Yes, the general feeling went, the United States had taken on unprecedented global responsibilities, but it had done so because American interests were directly threatened by an unprecedented global challenge. 

So Americans for more than four decades proved willing to support the expansive and active foreign policy that Roosevelt and his advisers had envisioned—indeed, probably much more than they envisioned—and the results were extraordinary. In the half-century following World War II, the United States successfully established, protected, and advanced a liberal world order, carving out a vast “free world” within which an unprecedented era of peace and prosperity could flower in Western Europe, East Asia, and the Western Hemisphere. Although tensions between the United States and the Soviet Union sometimes rose to dangerous levels, the period was characterized above all by peace among the great powers. The United States and the Soviet Union did not come to blows, and just as importantly, the American presence in Europe and East Asia put an end to the cycles of war that had torn both regions since the late nineteenth century. The number of democracies in the world grew dramatically. The international trading system expanded and deepened. Most of the world enjoyed an unprecedented prosperity. There was no shortage of disasters and near-disasters, as well as the two costly wars in Asia—but the strategy was largely successful, so much so that the Soviet empire finally collapsed or voluntarily withdrew, peacefully, under the pressure of the West’s economic and political success, and the liberal order then expanded to include the rest of Europe and most of Asia. All of this was the result of many forces—the political and economic integration of Europe, the success of Japan and Germany, and the rise of other successful Asian economies—but none of it would have been possible without a United States willing and able to play the abnormal and unusual role of preserver and defender of a liberal world order. 


America’s ability to play this role at all was due lessto the special virtues of the American people than to some remarkable advantages that put the United States in a historically unique position. The most important advantage was geography. For centuries the world’s cockpits of conflict had been in Europe, Asia, and the Middle East, where multiple powers shared common neighborhoods, jostled for primacy, and engaged in endless cycles of military competition and warfare. When the United States emerged as a great power at the end of the nineteenth century, it alone enjoyed fundamental security in a neighborhood in which it was already the unquestioned hegemon. This, along with its wealth and large population, gave the United States the ability to dispatch the bulk of its armed forces thousands of miles away to engage in protracted military operations. It also allowed the United States to station large numbers of troops permanently overseas if it so desired. And it could do all of this without leaving itself vulnerable to a neighboring power. 

No other nation in the world was ever so situated. Even that other great island superpower, Great Britain, sat too close to the European continent to be invulnerable to attack, especially when the airplane and the long-range missile became major tools of warfare. Nor had Britain succeeded in securing its core strategic requirement: preventing the emergence of a hegemon on the continent. Although successful for two centuries in maintaining and managing its overseas empire, Britain failed to prevent the rise of German hegemony twice in the twentieth century, leading to two devastating wars that ultimately undid British global power. Britain failed because it had tried to play the role of balancer in Europe from “offshore.” Britons’ main concern was always defense of their far-flung empire, and they preferred to stay out of Europe if possible. Their inability or unwillingness to station troops on the continent in sufficient number, or at least reliably to guarantee that sufficient force would arrive quickly in an emergency, led would-be aggressors to calculate that decisive British military force would either not arrive on time or not arrive at all. 

After World War II, Americans’ unique geographical advantage made possible an unprecedented global strategy. The United States was able to move beyond traditional national defense and beyond offshore balancing. It was able to become effectively both a European power and an Asian power, with troops permanently stationed “onshore” in both theaters simultaneously. The presence of American troops acted to remove doubt by potential aggressors that the United States would fight if its allies were attacked. For the next seven decades, this American presence enforced a general peace and stability in two regions that for at least a century had known almost constant great-power conflict. 

Just as remarkable was the degree to which the rest of the nations in the liberal world generally accepted and even welcomed America’s overwhelming power. Again, the reason had as much to do with power and geography as with ideological affinity. It was true that for most nations in the world the United States appeared to be a relatively benign hegemon. But the core geopolitical reality was that other nations faced greater and more immediate threats from their neighbors than from the distant Americans. When those neighbors grew menacing, they looked to the United States as a natural partner—comforting for its ability to project power and defend them but comforting also for its distance.

The United States thus violated some of the cardinal rules of international relations. For decades, realists had believed that the only peaceful and stable world order was one based on a multipolar balance of power, a “concert” of nations poised in rough equilibrium in a system that all the players regarded as necessary and legitimate—like Europe in the years following the Congress of Vienna. This was the world with which Henry Kissinger felt comfortable and which he constantly predicted, even in the 1960s, was just right around the corner. Unipolarity was supposed to be inherently unstable and short-lived, because other great powers would always band together to balance against a power grown too strong—as had happened in Europe in response to the rise of France and Germany in the nineteenth and twentieth centuries. Richard Nixon expressed this alleged realist truism in a speech, no doubt penned under Kissinger’s influence, in 1972. “We must remember,” Nixon declared, that “the only time in the history of the world that we have had any extended period of peace is when there has been balance of power. It is when one nation becomes infinitely more powerful in relation to its potential competitor that the danger of war arises. So I believe in a world in which the United States is powerful. I think it will be a safer world and a better world if we have a strong, healthy United States, Europe, Soviet Union, China, Japan, each balancing.” But the United States was already disproving this thesis.

The broad acceptance of American power, best demonstrated by the large number of its allies and the absence of powerful nations joining the Soviet Union against it, created a unique situation in the world. No other nation in history had ever played such a role on a global scale, and arguably no other nation possibly could. The situation could not conform to a theory because it could not be replicated. It was sui generis.

Geography made it possible for the United States to play this unique role in the world, but as the 1920s and 1930s showed, the question of whether the United States would take it on was up to the American people. Nothing required them to play such an abnormal part in world affairs. During the cold war, they did it primarily out of fear of communism. But what would happen when the Soviet Union disappeared and the threat of communism vanished? The question seemed moot for four excruciatingly long decades when no one ever really expected the Soviet Union to give up the geopolitical competition. But the unanticipated fall of the Soviet empire and the collapse of international communism after 1989 inevitably raised anew the question of how to define America’s purpose and its interests in the absence of an obvious threat. Suddenly, Americans were back to where Roosevelt had left off in the early 1940s, when the challenge had been to avoid the mistakes of the 1920s and 1930s. But would anyone remember the original grand strategy, devised in the brief moment before the Soviet Union arose to dominate American strategic thinking? Would the original grand strategy still seem relevant at the end of the twentieth century? Or had Americans, as the political scientist Robert Osgood worried in the 1950s, “become so transfixed by their fears of communism” that they had forgotten “what they are for in their obsession with what they are against”?

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