Colonial question Territorial expansion 20 History 18 Foreign relations 5 Frontier and pioneer life 5 Insular possessions 5 Diplomatic relations 4 more ... Imperialism 4 Political aspects 4 Territories and possessions 4 Government relations 3 Relations 3 Spanish-American War, 1898 3 Acculturation 2 Civilization 2 Globalization 2 Indians of North America 2 Indians, Treatment of 2 Influence 2 International relations 2 Pioneers 2 Politics and government 2 Racism 2 19e siècle 1 Aeronautics 1 African Americans 1 Americanization 1 Annexation to the United States 1 Armed Forces 1 Christianity and politics 1 less ...