Political Science|Political science (General)|United States Politics & Government 256 History|History of North and South America|History: America|United States|United States History 147 History|History of North and South America|History of the Americas|History: America|United States 96 Civil War period, 1861-1865|History|History of North and South America|History of the Americas|History: America|United States 29 American Civil War|Civil War period, 1861-1865|History|History of North and South America|History: America|United States 24 History|History of North and South America|History: America|Presidential Studies|United States|United States History 22 Political institutions and public administration (United States)|Political Science|Political Science & Studies|United States 22 America|History|History of North and South America|History: America|Indians of North America|United States History 20 Colonial history (1607-1775)|History|History of North and South America|History of the Americas|History: America|United States 20 Colonial history (1607-1775)|History|History of North and South America|History: America|United States|United States History 20 Law|United States Law 18 Political Science|United States Politics & Government 18 Abstracting, Bibliographies and Statistics|Education|Higher Education|History of education|Theory and practice of education|United States 14 Education|Higher education|History of education|Theory and practice of education|United States 12 Federal law. Common and collective state law|Law|Law of the United States 11 History|History of North and South America|History: America|Twentieth century|United States|World War I 10 History|History of North and South America|History: America|United States|World War I 10 Law|Law of the United States|United States Law 10 Abstracting, Bibliographies and Statistics|Education|Individual institutions - United States|Secondary education. High schools|Theory and practice of education|United States 8 Abstracting, Bibliographies and Statistics|Education|Individual institutions - United States|Theory and practice of education|United States 8 Academic Testing|Education|History of education|School administration and organization|Tests and Measurements|Theory and practice of education|United States 8 Academic Testing|Education|History of education|Tests and Measurements|Theory and practice of education|United States 8 Civil War period, 1861-1865|History|History of North and South America|History: America|United States|United States History 8 History|History of North and South America|History of the Americas|History: America|The Revolution, 1775-1783|United States 8 Abstracting, Bibliographies and Statistics|Education|Higher education|Individual institutions - United States|Theory and practice of education|United States 6 Abstracting, Bibliographies and Statistics|Education|History of education|Secondary Education|Secondary education. High schools|Theory and practice of education|United States 6 Abstracting, Bibliographies and Statistics|Education|History of education|United States 6 Auxiliary Sciences of History|Biographies|Biography|General|History|History of North and South America|History: America|United States|United States History 6 History|History of North and South America|History: America|Late nineteenth century, 1865-1900|Presidential Studies|United States 6 History|History of North and South America|History: America|Presidential Studies|Revolution to the Civil War, 1775/1783-1861|United States 6