Territories and possessions History 50 Politics and government 26 Colonies 13 Imperialism 12 Territorial expansion 9 Slavery 8 more ... Insular possessions 7 Constitutional law 5 Extension to the territories 5 Foreign relations 5 Administration 4 Race relations 4 Social conditions 4 Colonial question 3 Constitutional history 3 Economic conditions 3 Law 3 Surveying 3 Colonial influence 2 Colonists 2 Compromise of 1850 2 Government relations 2 Governors 2 History, Military 2 Justice, Administration of 2 Land settlement 2 Law and legislation 2 Liberalism 2 Military occupation 2 less ...