History 1,375 Social conditions 417 Politics and government 196 Social aspects 195 Race relations 169 Indians of North America 164 Social life and customs 164 hơn ... Description and travel 139 Motion picture industry 132 Gold mines and mining 127 Mexican Americans 126 African Americans 119 Ethnic relations 119 Gold discoveries 119 Immigrants 105 Motion pictures 104 Law and legislation 102 Ethnic identity 99 Economic conditions 98 History and criticism 97 Manners and customs 91 Artists' books 86 Emigration and immigration 82 Architecture 79 Japanese Americans 75 Chinese Americans 73 Political aspects 73 Government policy 69 Political activity 65 Education 63 ít hơn ...