Territorial expansion 76 History 41 Foreign relations 13 Frontier and pioneer life 12 Politics and government 10 Expansion territoriale 8 Histoire 7 more ... Indians of North America 7 Colonial question 6 Government relations 6 Imperialism 6 Race relations 6 Slavery 6 Discovery and exploration 4 Eastern question (Far East) 4 Explorers 4 HISTORY 4 Colonization 3 Diplomatic relations 3 Discoveries in geography 3 Extension to the territories 3 Historical geography 3 Immigration and emigration 3 Mexican War, 1846-1848 3 Politique et gouvernement 3 Public opinion 3 Social aspects 3 Spanish-American War, 1898 3 African American 2 African Americans 2 Attitudes envers les Indiens d'Amérique 2 Causes 2 Choctaw Indians 2 Colonial Period (1600-1775) 2 Colonialism 2 Community life 2 Enslaved persons 2 Ethnic Studies 2 Filibusters 2 Generals 2 less ...