Characteristic of American foreign policy since World War II has been the quest for a certain minimum of world order and a practical maximum of American control. Successive schemes for the regulation of power-collective security, bipolar confrontation, and now perhaps the balance of power-have differed in their objects and style. But interventionism-structuring the external political-military environment and determining the behavior of other nations, whether in collaboration, conflict or contention with them- has been the main underlying dimension of our policy. There has been no serious substantive challenge to this premise since the eve of our entry into World War II. The last "great debate," in 1951, over the dispatch of American troops to Europe, was about implementation and constitutional procedure.
Characteristic of American foreign policy since World War II has been the quest for a certain minimum of world order and a practical maximum of American control. Successive schemes for the regulation of power-collective security, bipolar confrontation, and now perhaps the balance of power-have differed in their objects and style. But interventionism-structuring the external political-military environment and determining the behavior of other nations, whether in collaboration, conflict or contention with them- has been the main underlying dimension of our policy. There has been no serious substantive challenge to this premise since the eve of our entry into World War II. The last "great debate," in 1951, over the dispatch of American troops to Europe, was about implementation and constitutional procedure.
How the world might look now had the United States not exercised itself for these 30 years, and how it might look 30 years from now if we were to cease exercising ourselves, are open to conjecture. More certain are the failures of deterrence and the costs of war and readiness. These speculations and reflections are materials for a larger debate about the critical objects and operational style of our foreign policy.
It is time for such a debate. We are at a turning point in our conception of the shape of the international system and our perception of the necessities and responsibilities it imposes on our foreign policy. This is more than the feeling that any year of crisis is a turning point, and more than the hope that after the tunnel of a long and obscure war we must be emerging into a new valley. Rather, longer historical perspective and larger categories of analysis indicate that the second of the major structural systems that followed World War II-bipolar confrontation-has been played out, and a new, but severely limited, set of alternative international systems is pending as both object and determinant of American foreign policy.
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The end of the bipolar postwar world" has been acknowledged by the latest presidential State of the World message. Although it is elliptic in describing the new design for a lasting and stable "structure of peace," there is little doubt that the blueprint for the future is inspired by the past. It is the model of the balance of power which moderated, if not the aspirations at least the accomplishments, of rulers in the eighteenth and nineteenth centuries. It restrained violence (without curtailing wars). It provided enough flexibility to ensure a century of global peace after the Congress of Vienna, despite drastic changes in the relative strengths and fortunes of the main actors.
America was thrust into the world some 30 years ago. That jolting experience generated in America a degree of unity concerning foreign affairs unusual for a democratic and pluralist society. Largely as a consequence of that shock, America's foreign policy came to enjoy for a quarter of a century the advantage of broad popular support and of a seeming sense of direction.
In the issue of Time of January 3, 1972, President Nixon is quoted as follows: "We must remember 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 the other, not playing one against the other, an even balance."

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