Territorial expansion History 458 Foreign relations 201 Expansion territoriale 140 Imperialism 135 Politics and government 103 Frontier and pioneer life 99 more ... Histoire 81 Indians of North America 76 Colonial question 68 Diplomatic relations 52 Political aspects 49 Colonies 48 Relations extérieures 46 Relations 37 Discovery and exploration 36 Government relations 36 Race relations 33 Spanish-American War, 1898 33 Social aspects 31 Wars 26 Public opinion 23 Historiography 22 Manifest Destiny 22 Civilization 21 History, Military 21 National characteristics, American 21 Politique et gouvernement 21 Impérialisme 19 Influence 19 less ...