History 40 Slavery 27 Politics and government 26 Extension to the territories 19 Emigration and immigration 16 Japanese 15 Compromise of 1850 13 more ... Social conditions 10 Chinese 8 Chinese Americans 8 Description and travel 8 Legal status, laws, etc 8 Race relations 7 Japanese Americans 6 Personal narratives 5 Biography 4 Cultural assimilation 4 Emigration and immigration law 4 Ethnic groups 4 Ethnic identity 4 Gold discoveries 4 Histoire 4 Land tenure 4 Law and legislation 4 Social life and customs 4 Speeches in Congress 4 Acculturation 3 African Americans 3 Afro-Americana 3 Asian Americans 3 British 3 Conditions sociales 3 Ethnic relations 3 Ethnicity 3 Germans 3 Indians of North America 3 Legislators 3 Mexicans 3 Naturalization 3 Noncitizens 3 less ...