Slavery 16 History 15 Annexation to the United States 13 Politics and government 12 Annexation 8 Extension to the territories 7 Description and travel 5 more ... Emigration and immigration 5 Afro-Americana 3 Germans 3 Mexican Americans 3 Mexicans 3 Census, 7th, 1850 2 Enslaved persons 2 Frontier and pioneer life 2 German Americans 2 Immigrants 2 Indexes 2 Military participation 2 Participation, Spanish 2 Registers of births, etc 2 Spanish 2 Travel 2 Vital records 2 %SP3 1 (B) Slavery in the United States 1 African American families 1 African Americans 1 Agricultural laborers 1 Anniversaries, etc 1 Army 1 Boundaries 1 Census, 1850 1 Census, 1860 1 Census, 1890 1 Census, 8th, 1860 1 Children 1 Civil rights 1 Concentration camps 1 Conditions sociales 1 less ...