History 1,203 History and criticism 161 Foreign relations 151 Politics and government 142 Social conditions 132 Slavery 123 Social aspects 116 more ... Colonies 104 African Americans 91 Slave trade 88 World War, 1939-1945 82 Race relations 81 Civilization 73 Commerce 69 Economic conditions 63 Political aspects 55 National security 54 Social life and customs 53 Intellectual life 52 World politics 52 American literature 51 Indians of North America 50 Military policy 50 Relations 50 Blacks 49 Emigration and immigration 48 Economic aspects 47 Antiquities 46 Slaves 46 Influence 45 less ...