Isolationism permanently ended with the U.S. entry into World War II. Since then ... that national security requires the maintenance of a balance of power in the major world regions.

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Although the United States and Soviet Union had begun a process of détente in 1970, both sides were still anxious that the other not achieve any advantage in the overall balance of power.

Lippmann’s balance of power geopolitics was evident in three main books: U.S. Foreign Policy: Shield of the Republic (1943), U.S. War Aims (1944), and The Cold War (1947).