Since the Vietnam War, public opinion has played an important role in policy makers' actions. Although their opinions may not always support the most favorable choice for that country, they are still elements of decision-making. Richard Sobel discusses several cases on how his attitudes influence policymakers' decisions in his book "Influence of public opinion on US diplomacy since Vietnam". During the Persian Gulf War, public opinion ultimately formed policies. Public opinion forms how the policy is achieved, not the purpose of the policy.
Holsti, Ole R., "Public Opinion and Foreign Policy: Almonds to the Mershon Series - Challenges of the Lipman Agreement: Research Projects and Discussion", International Studies Quarter, December 1992, pp. 439-466. World War I, World War II, and the Vietnam War had a great influence on the theory and research of public opinion and foreign policy. Three arguments about public opinion were raised: it is instability and therefore provides an inadequate foundation for stable and effective foreign policy; it has little influence on foreign policy
Public opinion seems to be more important as the foreign policy of the United States continues to change. Yankelovich and his colleagues said, "I wrote a new book on public opinion and foreign policy." Charles Williams, editor of the journal Foreign Policy published by the Carnegie International Peace Foundation, says: "There is nothing in the foreign policy of the United States" strategy "
Yankelovich, Daniel, 'Political policy after the election', Diplomacy, Fall 1992, 1 - 12 pages. Analysis of the characteristics of the public opinion of the recession in the United States and the influence of foreign policy in the 1992 presidential election. After the election, strong industrial policy may be the core of foreign policy of the United States. IM Destler, Leslie H. Gelb and Anthony Lake, "Segment: Impact of Domestic Politics on US Foreign Policy", Charles W. Kegley Jr. and Eugene R. Wittkopf (Editor), Domestic Information Sources for US Foreign Policy: Insight and evidence (1988), pp. 17-29. This article was written in 1984