History 50 968 Politics and government 15 274 Foreign relations 9 039 African Americans 7 936 Social conditions 6 957 Social aspects 6 888 Race relations 6 688 mer ... History and criticism 6 577 Civil rights 4 922 Slavery 4 906 Law and legislation 4 816 Political aspects 4 360 Presidents 4 346 Government policy 3 834 Racism 3 622 Economic conditions 3 444 Education 3 198 Civil rights movements 3 095 Women 2 989 Economic aspects 2 657 Social life and customs 2 391 American literature 2 325 World War, 1939-1945 2 309 Research 2 230 Civilization 2 165 Emigration and immigration 1 991 Study and teaching 1 930 Prevention 1 897 Relations 1 838 Intellectual life 1 827 mindre ...