History 251 Politics and government 90 Description and travel 79 Social conditions 29 Foreign relations 26 Social life and customs 23 Civilization 22 more ... African Americans 20 Discovery and exploration 18 Economic conditions 16 Slavery 15 Frontier and pioneer life 14 Sources 13 Indians of South America 12 Reconstruction (U.S. history, 1865-1877) 12 Antiquities 10 Histoire 10 Colonies 9 Indians of Mexico 9 Race relations 9 Blacks 8 Indians of North America 8 Communism 7 Missions 7 Overland journeys to the Pacific 7 Aztecs 6 Emigration and immigration 6 Incas 6 Jews 6 Puritans 6 less ...