Intellectual life History 25 Civilization 17 History and criticism 5 Popular culture 5 American literature 4 European federation 4 more ... Social conditions 4 Architecture 3 Buildings, structures, etc 3 Communism 3 Group identity 3 Mass society 3 National characteristics, European 3 Nationalism 3 Politics and government 3 Social aspects 3 World War, 1914-1918 3 Aesthetics, American 2 Authenticity (Philosophy) 2 Cultural industries 2 Cultural pluralism 2 Depressions 2 Economic conditions 2 Foreign public opinion, American 2 Historiography 2 Imitation 2 International relations 2 Liberalism 2 Material culture 2 less ...