Civilization Imperialism 30 History 25 Colonies 10 Foreign relations 6 Excavations (Archaeology) 4 Imperialism in literature 4 Philosophy 4 Political aspects 4 Roman influences 4 Social aspects 4 Colonies in literature 3 History and criticism 3 Nationalism 3 Politics and government 3 Territorial expansion 3 American influences 2 Antiquities, Roman 2 Decolonization 2 Decolonization in literature 2 Globalization 2 Group identity in literature 2 Historiography 2 Indians of North America 2 National characteristics, American 2 National characteristics, English 2 Political culture 2 Romans 2 Social conditions 2 World politics 2