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A cold war or cold warfare is a state of conflict between nations that does not involve direct military action but is pursued primarily through economic and political actions, propaganda, acts of espionage or proxy wars waged by surrogates.
For the foreign policy of the United States, the cold war defined the last half of the twentieth century. It was a war of ideas, of threats, and of actual fighting in the countries of Korea and Vietnam, pitting western nations against the Soviet Union and China and their Communist allies. The 1940s and 1950s saw the cold war bloom into a period of unparalleled suspicion, hostility, and persecution.