In 1950, the National Security Council produced a 58-page, top-secret report proclaiming the threat of Soviet communism. In the new postwar world, the report argued, the United States could no longer retreat toward isolationism without encouraging the aggressive expansion of communism across the globe. The United States, the report said, had to mobilize to ensure the survival of “civilization itself.”

Within the past thirty-five years the world has experienced two global wars of tremendous violence. It has witnessed two revolutions–the Russian and the Chinese–of extreme scope and intensity. It has also seen the collapse of five empires–the Ottoman, the Austro-Hungarian, German, Italian, and Japanese–and the drastic decline of two major imperial systems, the British and the French. During the span of one generation, the international distribution of power has been fundamentally altered. For several centuries it had proved impossible for any one nation to gain such preponderant strength that a coalition of other nations could not in time face it with greater strength. The international scene was marked by recurring periods of violence and war, but a system of sovereign and independent states was maintained, over which no state was able to achieve hegemony.

Two complex sets of factors have now basically altered this historic distribution of power. First, the defeat of Germany and Japan and the decline of the British and French Empires have interacted with the development of the United States and the Soviet Union in such a way that power increasingly gravitated to these two centers. Second, the Soviet Union, unlike previous aspirants to hegemony, is animated by a new fanatic faith, antithetical to our own, and seeks to impose its absolute authority over the rest of the world. Conflict has, therefore, become endemic and is waged, on the part of the Soviet Union, by violent or non-violent methods in accordance with the dictates of expediency. With the development of increasingly terrifying weapons of mass destruction, every individual faces the ever-present possibility of annihilation should the conflict enter the phase of total war.

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The issues that face us are momentous, involving the fulfillment or destruction not only of this Republic but of civilization itself. They are issues which will not await our deliberations. With conscience and resolution this Government and the people it represents must now take new and fateful decisions.

… The idea of freedom …  is peculiarly and intolerably subversive of the idea of slavery. But the converse is not true. The implacable purpose of the slave state to eliminate the challenge of freedom has placed the two great powers at opposite poles. It is this fact which gives the present polarization of power the quality of crisis.

… Thus unwillingly our free society finds itself mortally challenged by the Soviet system. No other value system is so wholly irreconcilable with ours, so implacable in its purpose to destroy ours, so capable of turning to its own uses the most dangerous and divisive trends in our own society, no other so skillfully and powerfully evokes the elements of irrationality in human nature everywhere, and no other has the support of a great and growing center of military power.

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In a shrinking world, which now faces the threat of atomic warfare, it is not an adequate objective merely to seek to check the Kremlin design, for the absence of order among nations is becoming less and less tolerable. This fact imposes on us, in our own interests, the responsibility of world leadership. It demands that we make the attempt, and accept the risks inherent in it, to bring about order and justice by means consistent with the principles of freedom and democracy. …

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Compulsion is the negation of freedom, except when it is used to enforce the rights common to all. The resort to force, internally or externally, is therefore a last resort for a free society. The act is permissible only when one individual or groups of individuals within it threaten the basic rights of other individuals or when another society seeks to impose its will upon it. The free society cherishes and protects as fundamental the rights of the minority against the will of a majority, because these rights are the inalienable rights of each and every individual.

… Practical and ideological considerations therefore both impel us to the conclusion that we have no choice but to demonstrate the superiority of the idea of freedom by its constructive application, and to attempt to change the world situation by means short of war in such a way as to frustrate the Kremlin design and hasten the decay of the Soviet system.

For us the role of military power is to serve the national purpose by deterring an attack upon us while we seek by other means to create an environment in which our free society can flourish, and by fighting, if necessary, to defend the integrity and vitality of our free society and to defeat any aggressor. The Kremlin uses Soviet military power to back up and serve the Kremlin design. It does not hesitate to use military force aggressively if that course is expedient in the achievement of its design. The differences between our fundamental purpose and the Kremlin design, therefore, are reflected in our respective attitudes toward and use of military force.

Our free society, confronted by a threat to its basic values, naturally will take such action, including the use of military force, as may be required to protect those values. The integrity of our system will not be jeopardized by any measures, covert or overt, violent or non-violent, which serve the purposes of frustrating the Kremlin design, nor does the necessity for conducting ourselves so as to affirm our values in actions as well as words forbid such measures, provided only they are appropriately calculated to that end and are not so excessive or misdirected as to make us enemies of the people instead of the evil men who have enslaved them.

[Source: NSC 68: United States Objectives and Programs for National Security (April 14, 1950). Available online via Truman Library, http://www.trumanlibrary.org/whistlestop/study_collections/coldwar/documents/pdf/10-1.pdf.]