History 66 Politics and government 23 Diplomatic relations 16 Foreign relations 16 African Americans 10 Social conditions 8 Enslavement 6 Historiography 6 Slavery 6 Anti-slavery movements 5 Antislavery movements 5 Abolitionists 4 Communism 4 Economic conditions 4 Frontier and pioneer life 4 Prohibition 4 Public welfare 4 Reconstruction (U.S. history, 1865-1877) 4 World War, 1939-1945 4 Cities and towns 3 Elections 3 Emigration and immigration 3 Freed persons 3 Law 3 Law and legislation 3 Political parties 3 Progressivism (United States politics) 3 Race relations 3 Socialism 3 Agricultural laborers 2