History 140 Politics and government 43 Mexican Americans 23 Social conditions 20 Emigration and immigration 19 Ethnic relations 16 African Americans 15 more ... Race relations 15 Political aspects 14 Soldiers 14 Foreign relations 13 Frontier and pioneer life 13 Reconstruction (U.S. history, 1865-1877) 13 Social aspects 13 Legislators 12 Campaigns 11 Economic aspects 10 Influence 10 World War, 1939-1945 9 Armed Forces 8 Civil rights 8 Governors 8 Mexicans 8 Military campaigns 8 Territorial expansion 8 Veterans 8 Economic conditions 7 Generals 7 Hispanic Americans 7 History and criticism 7 less ...