Public opinion plays an unprecedented role in foreign policy making in Africa as well as in other advanced and sophisticated nations in the international system. However, in the United States of America and Nigeria, empirical evidence shows that public opinion has little or no significant effects on foreign policy decision-making. Several reasons abound for this, some of these reasons are the unwillingness of the political elites to embrace transparency, accountability, and inclusive governance. The study therefore examines the views of scholars on the role of public opinion in foreign policy making in the United States of America and Nigeria. The secondary source of data collection was adopted, data include archival materials, periodical publications, books, and the internet. Most of these materials were sourced through an extensive use of specialized library facilities of the Nigerian Institute of International Affairs (NIIA). The research is descriptive and analytical. The study recommends that the American and Nigerian governments should encourage public opinion in foreign policy making. The researcher also recommend that scholars of International Relations should focus in their research on the role of Government in allowing the input of the public in both domestic and international politics. Keywords: Public Opinion, Foreign Policy, policy, United States of America, Nigeria.
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