George F. Kennan. “America’s diplomatic chief of considers the riddle of diminishing U.S world security in this challenging appraisal of this country’s foreign relations during the first half of the twentieth century. His candid, knowledgeable evaluation of U.S. principles and polices and his recommendations for future American policy should be read by everyone who is eager o preserve peace and stability in the world. “A nation which excuses its own failures by the sacred untouchableness of its own habits can excuse itself into complete disaster.