History 26,997 Politics and government 10,330 Foreign relations 6,599 African Americans 6,472 Indians of North America 5,476 Histoire 4,258 Race relations 4,134 更多 ... Social conditions 4,027 Presidents 3,411 Politique et gouvernement 2,410 Civilization 2,366 Social life and customs 2,312 Campaigns 2,126 Civil rights 1,857 Publications about Graduates 1,758 Diplomatic relations 1,747 Relations extérieures 1,662 Noirs américains 1,643 Slavery 1,623 Antiquities 1,500 Generals 1,375 Description and travel 1,296 Social aspects 1,270 Government relations 1,215 Economic conditions 1,185 Regimental histories 1,154 Political aspects 1,105 Ethnic relations 1,042 Racism 960 Intellectual life 935 少 ...