In 1952, Frank L. Klingberg's article on introvert and extrovert American foreign policy moods projected an American turn toward introversion in the late 1960's. After this came to pass, Jack Holmes began to develop a theory of how these moods might work in a more specific sense. His mood/interest theory points to a basic conflict between politico-military interests and the foreign policy moods of the American electorate. Holmes presents a pioneering account of the over-whelming impact of public moods on foreign policy. Policy-making structures, executive-legislative relations, presidential...