History Imperialism 410 Colonies 124 Foreign relations 81 History and criticism 71 Imperialism in literature 67 Social aspects 66 Politics and government 62 Political aspects 43 Territorial expansion 42 Colonization 33 Relations 33 Colonies in literature 28 Economic conditions 27 Public opinion 26 Civilization 25 Nationalism 25 English literature 24 Race relations 24 Historiography 23 Social conditions 23 Racism 22 Immigrants 20 In literature 20 Labor 20 Philosophy 18 Ethnic relations 17 Industries 17 Indians of North America 16 Intellectual life 16