History 670 African Americans 222 Politics and government 211 Periodicals 165 Slavery 142 Description and travel 114 Indians of North America 107 more ... Sources 93 Societies, etc 92 Genealogy 85 Bibliography 84 Emigration and immigration 82 Refugees 82 Education 71 Statistics 69 Social life and customs 67 Presidents 62 Economic conditions 61 Social conditions 61 Archives 57 Civil rights 54 Population 54 Emigration and immigration law 52 Minorities 51 Legislators 50 Legal status, laws, etc 47 Biography 45 Congresses 45 Race relations 45 Histoire 44 Registers of births, etc 44 Historic buildings 43 Employment 42 Law and legislation 41 Architecture 39 Foreign relations 39 Museums 38 Political activity 33 Conservation and restoration 32 Government relations 32 less ...