History 21,198 Politics and government 9,463 Foreign relations 6,524 African Americans 3,812 Histoire 3,598 Race relations 3,473 Presidents 3,346 Máis ... Social conditions 2,915 Politique et gouvernement 2,300 Civilization 2,242 Campaigns 1,987 Diplomatic relations 1,737 Relations extérieures 1,653 Civil rights 1,350 Social life and customs 1,325 Generals 1,296 Slavery 1,231 Social aspects 1,118 Regimental histories 1,105 Description and travel 1,041 Political aspects 1,040 Indians of North America 1,001 Noirs américains 995 Publications about Graduates 983 Ethnic relations 913 Relations 902 Racism 873 Economic conditions 819 Intellectual life 809 Legislators 785 menos ...