Political Science|Political science (General)|United States Politics & Government 106 Diplomacy & International Relations|International relations|Political Science 44 History|History of North and South America|History: America|Presidential Studies|United States|United States History 20 History|History of North and South America|History: America|United States|United States History 14 History|History of North and South America|History of the Americas|History: America|United States 10 Education|Engineering and Technology|Technology 8 Political Science|United States Politics & Government 8 International relations|Political Science|Political Science & Studies 6 Military and Defense|Military and Naval Science|Military History & Science|Military science|Military science (General) 6 Political Science|Political Science & Studies|Political science (General) 5 America|History|History of North and South America|History of the Americas|History: America|Indians of North America 4 Civil Rights|Human Rights|Political Science|Political science (General) 4 Civil War period, 1861-1865|History|History of North and South America|History of the Americas|History: America|United States 4 History|History of North and South America|History: America|Twentieth century|United States|United States History 4 Intergovernmental congresses and conferences|Judicial Process|Law|Law of nations 4 Law 4 Science|Sciences|Zoology 4 Abstracting, Bibliographies and Statistics|Classes|Communities. Classes. Races|Education|Higher education|Social Sciences|Sociology|Theory and practice of education 2 Abstracting, Bibliographies and Statistics|Communities. Classes. Races|Education|History of education|Social Sciences|Sociology|United States 2 African American Studies|History|History (General)|History (General) and History of Europe 2 Agriculture|Agriculture (General)|Conservation and Natural Resources|Conservation Biology|Conservation of natural resources|Environmental Issues|Political Science|Political science (General)|Sciences 2 Agriculture|Agriculture (General)|Conservation and Natural Resources|Conservation of natural resources|Environmental Issues|Erosion Control & Soil Conservation|Political Science|Sciences|United States Politics & Government 2 American Civil War|Civil War period, 1861-1865|History|History of North and South America|History: America|United States 2 America|History|History of North and South America|History: America|Indians of North America|United States History 2 Armed Forces|Military and Defense|Military and Naval Science|Military science|Military science (General) 2 Armies: Organization, distribution, military situation|Military and Defense|Military and Naval Science|Military History & Science|Military science 2 Atomic Energy|Atomic physics. Constitution and properties of matter|Energy|Nuclear Power|Physics|Science|Sciences 2 Banking, Finance & Investing|Business and Economics|Business and Economics (General)|Finance|Investment, capital formation, speculation|Social Sciences 2 Business and Economics|Business and Economics (General)|By region or country|Economic History|Economic history and conditions|Economic History, Conditions|Social Sciences 2 Business and Economics|Business and Economics (General)|Diplomacy & International Relations|Economic Assistance and Development|Economic history and conditions|Economic Policy|International relations|Political Science|Social Sciences 2