History Politics and government Social conditions 148 Foreign relations 71 Economic conditions 64 Nationalism 62 Political culture 52 World War, 1939-1945 47 Communism 44 National socialism 37 Influence 35 Political activity 32 Fascism 31 Political aspects 30 Sources 30 Ethnic relations 27 Social life and customs 27 Political parties 23 Civilization 21 Presidents 21 Radicalism 21 Social aspects 21 Causes 20 Intellectual life 19 Revolutions 19 Public opinion 18 Statesmen 18 Autonomy and independence movements 17 Colonies 17 Jews 17