History 416 Social conditions 112 Politics and government 69 Race relations 58 Social aspects 50 Social life and customs 47 African Americans 39 more ... Ethnic relations 34 Motion picture industry 31 Ethnic identity 30 Mexican Americans 28 Economic conditions 27 Immigrants 23 Manners and customs 23 Motion pictures 23 Gold discoveries 22 Japanese Americans 22 Civil rights 21 Gold mines and mining 21 Indians of North America 21 Political aspects 19 Political activity 18 Emigration and immigration 17 History and criticism 17 Economic history 15 Intellectual life 15 Chinese Americans 14 Frontier and pioneer life 14 World War, 1939-1945 14 Community life 13 less ...