Colonization History 98 Indians of North America 33 African Americans 32 Imperialism 25 Race relations 20 Slavery 20 more ... Social aspects 19 Colonies 17 Foreign relations 17 Historiography 14 Social conditions 14 Politics and government 13 Political aspects 12 Racism 12 Relations 11 Government relations 10 International relations 9 Ethnic identity 8 Ethnic relations 8 Indians, Treatment of 8 Diplomatic relations 7 Study and teaching 7 Territorial expansion 7 Territories and possessions 7 American literature 6 Antiquities 6 Antislavery movements 6 Emancipation 6 Frontier and pioneer life 6 less ...