Emigration and immigration History 72 Immigrants 22 Social conditions 14 Government policy 12 Ethnic relations 11 Race relations 8 Refugees 8 Politics and government 6 Social aspects 5 World War, 1939-1945 5 Blacks 4 Irish 4 Jews 4 Racism 4 African diaspora 3 British 3 Colonies 3 Germans 3 Intellectual life 3 Minorities 3 Social movements 3 Antinuclear movement 2 Chinese 2 Civil rights 2 Civilization 2 Cultural assimilation 2 Europeans 2 Feminism 2 Imperialism 2