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date: 13 August 2020

Summary and Keywords

In 1952, Frank L. Klingberg identified U.S. foreign policy moods since 1776 as alternating between an average of 21 years of introversion and 27 years of extroversion. The last extrovert phase had started in 1940, and it changed to introversion by 1968. By 1989, extroversion had returned. By 2016, it looks like introversion came back again. This is an excellent record of projection that calls for increased research by scholars.

In 1985, Jack Holmes related Klingberg’s moods to American Liberalism and argued that mood changes were required by tendencies of introversion and extroversion to reach extremes too far removed from the realist interests that a nation must pursue. Frank was kind enough to write the preface of my 1985 work, and we continued to meet annually at conventions to explore research possibilities through the last two decades of his life. Although he was from the liberal pre-WW II generation and I was from the realist post-WW II generation, we shared a common interest in American foreign policy moods since 1776 and the need for research by the community of scholars.

What do these moods mean? They consider one liberal democratic country while it grew from a peripheral power to a superpower over 240 years, and additional research regarding other countries would be beneficial. Given the concentration of major U.S. foreign policy assertiveness during extrovert phases as well as surprises and changes during mood transitions, moods need to be researched until they become part of the regular conversation regarding American Foreign Policy and IR theory. The evidence is strong and has been mostly developed by two authors. Klingberg deserves full credit for the original research and idea. The evidence has been expanded and placed in context by Holmes who analyzed Klingberg’s original idea as two different liberal preferences of the American people and related it to interests of nations. This liberal foreign policy variation (between introversion and extroversion) differs from the domestic policy variation (between reform liberal [often called liberal] and business liberal [often called conservative]) variation mentioned by Samuel Huntington in 1957. While individual domestic policy preferences usually stay the same, the United States as a whole varies on its introvert or extrovert foreign policy preference. Additional research on these moods is needed to enrich the literature.

Keywords: public influence, foreign policy, moods, interests, liberalism, realism, introversion, isolationism, extroversion, assertiveness, constructivism, long-term cycle theories, stages, phases, patterns, challenges, Frank Klingberg, empirical international relations theory

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