History 780 Politics and government 212 Social aspects 140 Social conditions 125 History and criticism 117 Research 111 Political aspects 99 more ... Foreign relations 98 Government policy 92 African Americans 83 Race relations 77 American literature 59 Evaluation 53 Women 52 Economic aspects 50 Economic conditions 50 Medical care 50 Study and teaching 49 Education 48 Law and legislation 45 Intellectual life 42 Prevention 42 Social life and customs 42 Public opinion 40 Political activity 39 Presidents 38 Technological innovations 37 Medical policy 36 Influence 35 Slavery 35 less ...