United States Foreign relations 99 History 97 Politics and government 91 Social conditions 75 Economic conditions 45 Social problems 37 Economic policy 32 Biography 30 Race relations 30 Education 24 Management 23 Civilization 21 Ethnic relations 21 Foreign economic relations 19 Social policy 19 Sociology 19 Minorities 17 Case studies 15 Terrorism 14 Armed Forces 13 Social aspects 13 Directories 12 Family 12 Japan 12 Military policy 12 Government policy 11 National security 11 Prevention 11 Relations 11