History 836 Social conditions 260 Politics and government 150 Social aspects 137 Race relations 110 Indians of North America 109 Motion picture industry 85 more ... Ethnic relations 82 Emigration and immigration 79 Social life and customs 79 Description and travel 75 Gold discoveries 73 African Americans 67 Mexican Americans 66 Immigrants 64 Economic conditions 63 Motion pictures 61 Ethnic identity 53 Political aspects 51 Government policy 50 Political activity 47 Environmental aspects 46 Frontier and pioneer life 43 History and criticism 43 Environmental conditions 42 Law and legislation 41 City planning 38 Hispanic Americans 38 Japanese Americans 36 Education 35 less ...