Colonial question Territorial expansion 37 History 33 Foreign relations 20 Imperialism 16 Politics and government 14 Political aspects 10 more ... Frontier and pioneer life 5 Relations 5 Annexation to the United States 4 Colonies 4 Insular possessions 4 Manifest Destiny 4 Political messianism 4 Racism 4 Spanish-American War, 1898 4 Christianity and politics 3 Democracy 3 Foreign public opinion, American 3 Slavery 3 Territories and possessions 3 Civilization 2 Economic conditions 2 Extension to the territories 2 Globalization 2 Land settlement 2 Louisiana Purchase 2 Philosophy 2 Political activity 2 Political culture 2 less ...