History 1,454 Nationalism 756 Politics and government 659 National socialism 261 National security 242 Foreign relations 240 Social aspects 209 History and criticism 201 Social conditions 181 Political aspects 164 Civilization 145 Economic conditions 129 Ethnic relations 103 Education 94 Study and teaching 89 Government policy 86 Historiography 84 Exhibitions 82 Research 82 World War, 1939-1945 78 Ethnicity 75 Economic aspects 71 English literature 67 Criticism and interpretation 66 Group identity 66 Economic policy 65 Political culture 62 National characteristics, American 61 International relations 60 Social life and customs 60