History|History of North and South America|History: America|United States|United States History 73 History|History of North and South America|History of the Americas|History: America|United States 46 Military and Defense|Military and Naval Science|Military History & Science|Military science|Military science (General) 18 Civil War period, 1861-1865|History|History of North and South America|History of the Americas|History: America|United States 13 American Civil War|Civil War period, 1861-1865|History|History of North and South America|History: America|United States 12 History|History of North and South America|History: America|Presidential Studies|United States|United States History 11 America|History|History of North and South America|History: America|Indians of North America|United States History 10 Colonial history (1607-1775)|History|History of North and South America|History of the Americas|History: America|United States 10 Colonial history (1607-1775)|History|History of North and South America|History: America|United States|United States History 10 Abstracting, Bibliographies and Statistics|Education|Higher Education|History of education|Theory and practice of education|United States 7 Education|Higher education|History of education|Theory and practice of education|United States 6 History|History (General) and History of Europe 6 History|History of North and South America|History: America|Twentieth century|United States|World War I 5 History|History of North and South America|History: America|United States|World War I 5 Academic Testing|Education|History of education|School administration and organization|Tests and Measurements|Theory and practice of education|United States 4 Academic Testing|Education|History of education|Tests and Measurements|Theory and practice of education|United States 4 America|History|History of North and South America|History of the Americas|History: America|Indians of North America 4 Civil War period, 1861-1865|History|History of North and South America|History: America|United States|United States History 4 History|History of North and South America|History of the Americas|History: America|The Revolution, 1775-1783|United States 4 Abstracting, Bibliographies and Statistics|Education|History of education|Secondary Education|Secondary education. High schools|Theory and practice of education|United States 3 Abstracting, Bibliographies and Statistics|Education|History of education|United States 3 Asian History|History|History (General) and History of Europe|History of Asia 3 Auxiliary Sciences of History|Biographies|Biography|General|History|History of North and South America|History: America|United States|United States History 3 History|History of North and South America|History: America|Late nineteenth century, 1865-1900|Presidential Studies|United States 3 History|History of North and South America|History: America|Presidential Studies|Revolution to the Civil War, 1775/1783-1861|United States 3 Abstracting, Bibliographies and Statistics|Early Childhood and Primary Education|Education|History of education|Theory and practice of education|United States 2 Abstracting, Bibliographies and Statistics|Education|Elementary or public school education|History of education|Theory and practice of education|United States 2 Abstracting, Bibliographies and Statistics|Education|History of education|Social pathology. Social and public welfare.|Social Sciences|Social Services|Social Services and Welfare|Sociology|United States 2 Academic Testing|Education|History of education|Mathematics|Science|Sciences|Tests and Measurements|United States 2 American Revolutionary War|History|History of North and South America|History: America|The Revolution, 1775-1783|United States 2