History 225 Social conditions 48 Politics and government 43 Jews 34 African Americans 31 Bibliography 30 Census records 28 more ... Sources 27 Education 26 Archives 25 Emigration and immigration 24 Histoire 24 Ethnic groups 23 Immigrants 23 Genealogy 20 Social life and customs 20 Italian Americans 19 Italians 17 Description and travel 16 World War, 1914-1918 15 Biography 14 Communism 14 Puerto Ricans 13 Race relations 12 Anniversaries, etc 11 Ethnic relations 11 German Americans 11 Slavery 11 Societies, etc 11 Archival resources 10 Churches 10 Congresses 10 Directories 10 Minorities 10 Study and teaching 10 Chinese Americans 9 Economic conditions 9 Political activity 9 Women 9 Clergy 8 less ...