History Imperialism Foreign relations 104 Territorial expansion 71 Political aspects 47 Race relations 35 Politics and government 34 more ... Social aspects 34 Relations 30 Racism 27 Colonization 18 Colonies 14 Economic aspects 14 Indians of North America 14 Colonial question 12 National characteristics, American 12 Political culture 12 Social conditions 12 Territories and possessions 11 Foreign public opinion, American 10 Globalization 10 Influence 10 Nationalism 10 Philosophy 10 African Americans 9 Foreign economic relations 9 Imperialism in literature 9 Moral and ethical aspects 9 American literature 7 Annexation to the United States 7 less ...