Moreover, while America’s revolutionary origins and republican form of government might make it sympathetic toward those seeking freedom elsewhere, America’s early leaders cautioned against idealistic attempts to export our way of life; according to John Quincy Adams, America should not go “abroad in search of monsters to destroy” nor “become the dictatress of the world.” Providence had charged America with the task of making a new world, not reforming the old; protected by an ocean and with the bounty of a continent, America could best serve the cause of freedom by concentrating on its own development, becoming a beacon of hope for other nations and people around the globe.
But if suspicion of foreign entanglements is stamped into our DNA, then so is the impulse to expand — geographically, commercially, and ideologically. Thomas Jefferson expressed early on the inevitability of expansion beyond the boundaries of the original thirteen states, and his timetable for such expansion was greatly accelerated with the Louisiana Purchase and the Lewis and Clark expedition. The same John Quincy Adams who warned against U.S. adventurism abroad became a tireless advocate of continental expansion and served as the chief architect of the Monroe Doctrine — a warning to European powers to keep out of the Western Hemisphere. As American soldiers and settlers moved steadily west and southwest, successive administrations described the annexation of territory in terms of “manifest destiny”—the conviction that such expansion was preordained, part of God’s plan to extend what Andrew Jackson called “the area of freedom” across the continent.
Of course, manifest destiny also meant bloody and violent conquest — of Native American tribes forcibly removed from their lands and of the Mexican army defending its territory. It was a conquest that, like slavery, contradicted America’s founding principles and tended to be justified in explicitly racist terms, a conquest that American mythology has always had difficulty fully absorbing but that other countries recognized for what it was — an exercise in raw power.
With the end of the Civil War and the consolidation of what’s now the continental United States, that power could not be denied. Intent on expanding markets for its goods, securing raw materials for its industry, and keeping sea lanes open for its commerce, the nation turned its attention overseas. Hawaii was annexed, giving America a foothold in the Pacific. The Spanish-American War delivered Puerto Rico, Guam, and the Philippines into U.S. control; when some members of the Senate objected to the military occupation of an archipelago seven thousand miles away — an occupation that would involve thousands of U.S. troops crushing a Philippine independence movement — one senator argued that the acquisition would provide the United States with access to the China market and mean “a vast trade and wealth and power.” America would never pursue the systematic colonization practiced by European nations, but it shed all inhibitions about meddling in the affairs of countries it deemed strategically important. Theodore Roosevelt, for example, added a corollary to the Monroe Doctrine, declaring that the United States would intervene in any Latin American or Caribbean country whose government it deemed not to America’s liking. “The United States of America has not the option as to whether it will or it will not play a great part in the world,” Roosevelt would argue. “It must play a great part. All that it can decide is whether it will play that part well or badly.”
By the start of the twentieth century, then, the motives that drove U.S. foreign policy seemed barely distinguishable from those of the other great powers, driven by realpolitik and commercial interests. Isolationist sentiment in the population at large remained strong, particularly when it came to conflicts in Europe, and when vital U.S. interests did not seem directly at stake. But technology and trade were shrinking the globe; determining which interests were vital and which ones were not became increasingly difficult. During World War I, Woodrow Wilson avoided American involvement until the repeated sinking of American vessels by German U-boats and the imminent collapse of the European continent made neutrality untenable. When the war was over, America had emerged as the world’s dominant power — but a power whose prosperity Wilson now understood to be linked to peace and prosperity in faraway lands.
It was in an effort to address this new reality that Wilson sought to reinterpret the idea of America’s manifest destiny. Making “the world safe for democracy” didn’t just involve winning a war, he argued; it was in America’s interest to encourage the self-determination of all peoples and provide the world a legal framework that could help avoid future conflicts. As part of the Treaty of Versailles, which detailed the terms of German surrender, Wilson proposed a League of Nations to mediate conflicts between nations, along with an international court and a set of international laws that would bind not just the weak but also the strong. “This is the time of all others when Democracy should prove its purity and its spiritual power to prevail,” Wilson said. “It is surely the manifest destiny of the United States to lead in the attempt to make this spirit prevail.”
Wilson’s proposals were initially greeted with enthusiasm in the United States and around the world. The U.S. Senate, however, was less impressed. Republican Senate Leader Henry Cabot Lodge considered the League of Nations — and the very concept of international law — as an encroachment on American sovereignty, a foolish constraint on America’s ability to impose its will around the world. Aided by traditional isolationists in both parties (many of whom had opposed American entry into World War I), as well as Wilson’s stubborn unwillingness to compromise, the Senate refused to ratify U.S. membership in the League.
For the next twenty years, America turned resolutely inward — reducing its army and navy, refusing to join the World Court, standing idly by as Italy, Japan, and Nazi Germany built up their military machines. The Senate became a hotbed of isolationism, passing a Neutrality Act that prevented the United States from lending assistance to countries invaded by the Axis powers, and repeatedly ignoring the President’s appeals as Hitler’s armies marched across Europe. Not until the bombing of Pearl Harbor would America realize its terrible mistake. “There is no such thing as security for any nation — or any individual — in a world ruled by the principles of gangsterism,” FDR would say in his national address after the attack. “We cannot measure our safety in terms of miles on any map any more.”
In the aftermath of World War II, the United States would have a chance to apply these lessons to its foreign policy. With Europe and Japan in ruins, the Soviet Union bled white by its battles on the Eastern Front but already signaling its intentions to spread its brand of totalitarian communism as far as it could, America faced a choice. There were those on the right who argued that only a unilateral foreign policy and an immediate invasion of the Soviet Union could disable the emerging communist threat. And although isolationism of the sort that prevailed in the thirties was now thoroughly discredited, there were those on the left who downplayed Soviet aggression, arguing that given Soviet losses and the country’s critical role in the Allied victory, Stalin should be accommodated.
America took neither path. Instead, the postwar leadership of President Truman, Dean Acheson, George Marshall, and George Kennan crafted the architecture of a new, postwar order that married Wilson’s idealism to hardheaded realism, an acceptance of America’s power with a humility regarding America’s ability to control events around the world. Yes, these men argued, the world is a dangerous place, and the Soviet threat is real; America needed to maintain its military dominance and be prepared to use force in defense of its interests across the globe. But even the power of the United States was finite — and because the battle against communism was also a battle of ideas, a test of what system might best serve the hopes and dreams of billions of people around the world, military might alone could not ensure America’s long-term prosperity or security.