History 38 Politics and government 16 Social aspects 11 Economic aspects 8 Social conditions 8 World War, 1939-1945 7 Philosophy 6 Economic policy 5 Management 5 Political aspects 5 Race relations 5 African Americans 4 Campaigns 4 Causes 4 Education 4 Influence 4 Influence (Literary, artistic, etc.) 4 Social change 4 Technological innovations 4 War 4 Diplomatic relations 3 Economic conditions 3 Economic history 3 Foreign relations 3 Industrial management 3 Mathematics 3 Military campaigns 3 Minorities 3 Psychology 3 Relations 3