History 1,174 Politics and government 397 Revolutions 138 Social conditions 100 History and criticism 82 Social aspects 82 Economic conditions 64 Influence 64 Foreign relations 60 Political aspects 55 Communism 45 Technological innovations 44 Economic aspects 39 Sources 38 Women 35 Science 33 Information technology 32 Intellectual life 32 Philosophy 31 Causes 28 Industries 28 Civilization 27 English literature 25 Political activity 25 Socialism 25 Criticism and interpretation 24 Industrial revolution 24 Protest movements 24 Radicalism 24 World politics 24