History 58,101 Politics and government 18,069 Foreign relations 9,239 African Americans 8,801 Social conditions 8,186 Social aspects 7,656 Race relations 7,298 更多 ... History and criticism 7,285 Slavery 5,185 Civil rights 5,145 Political aspects 5,025 Law and legislation 5,000 Presidents 4,367 Government policy 4,134 Economic conditions 4,085 Education 3,872 Church and state 3,831 Racism 3,691 Women 3,363 Civil rights movements 3,188 Economic aspects 3,147 Social life and customs 3,120 American literature 2,607 Civilization 2,449 World War, 1939-1945 2,383 Research 2,363 Intellectual life 2,179 Emigration and immigration 2,144 Study and teaching 2,027 Indians of North America 2,020 少 ...