Who was the author of the 1946 rationale for a hard-line U.S.foreign policy of containment?

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The author of the 1946 rationale for a hard-line U.S. foreign policy of containment was George F. Kennan, a career diplomat who was serving as the deputy chief of mission at the U.S. embassy in Moscow at the time. His article, "The Sources of Soviet Conduct," appeared in the journal Foreign Affairs under the pseudonym "X." It argued that the Soviet Union was expansionist by nature and that the U.S. needed to adopt a policy of "containment" to prevent the spread of communism throughout the world. Kennan's ideas had a profound influence on U.S. foreign policy for decades to come.

Who Was the Author of the 1946 Rationale for a Hard-Line