Congresses 67 History 46 Labor unions 17 Emigration and immigration law 15 Emigration and immigration 13 Politics and government 13 Societies, etc 13 more ... Minorities 12 Antislavery movements 11 African Americans 10 Legal status, laws, etc 10 Genealogy 9 Histoire 9 Clothing trade 8 Clothing workers 8 Slavery 8 Charities 7 Immigrants 7 Public welfare 7 Race relations 7 Refugees 7 Constitutional history 6 Employment 6 Ethnicity 5 Indians of North America 5 Jews 5 Labor movement 5 Noncitizens 5 Older people 5 Social conditions 5 Women 5 Working class 5 Asylum, Right of 4 Civilization 4 Congrès 4 Croats 4 Economic conditions 4 Education 4 Foreign workers 4 Hispanic Americans 4 less ...