Intellectual life Social change 52 History 41 Social conditions 20 Politics and government 13 Social aspects 12 Intellectuals 9 Popular culture 8 Social life and customs 8 Influence 6 Political aspects 6 Collective memory 5 Relations 5 African Americans 4 Civilization 4 Political and social views 4 Political culture 4 Race relations 4 City and town life 3 Cultural policy 3 Learning and scholarship 3 Moral conditions 3 Socialism 3 Technological innovations 3 World War, 1914-1918 3 African American philosophy 2 Art and state 2 Civil rights 2 Communication in learning and scholarship 2 Communication of technical information 2