Territorial expansion History 39 Foreign relations 9 Imperialism 9 Political aspects 9 Colonial question 8 Politics and government 8 tuilleadh ... Frontier and pioneer life 7 Relations 5 Colonies 4 Historiography 4 Philosophy 4 Colonization 3 Economic aspects 3 Economic conditions 3 Frontier thesis 3 Government relations 3 Historical geography 3 Indians of North America 3 National characteristics, American 3 Social aspects 3 Campaigns 2 Causes 2 Civilization 2 Colonies in literature 2 Discoveries in geography 2 Globalization 2 History and criticism 2 Imperialism in literature 2 Intellectual life 2 lúide ...