Comprising four lectures: The two planes of International Reality; The Non-Soviet World; The Problem of Soviet Power; and The Unifying Factor. The task of international politics at the present time, writes Mr. Kennan, is "to find means to permit change to proceed without repeatedly shaking the peace of the world." American foreign policy, he believes, has too often been dangerously unrealistic and has operated under certain misconceptions about the United States' role in the community of nations...