History 62 Colonies 39 Discovery and exploration 14 Civilization 13 Indians 10 Politics and government 10 Slave trade 10 more ... Colonization 9 Commerce 7 Imperialism 6 Social aspects 6 Economic conditions 5 Europeans 5 Territorial expansion 5 Acculturation 4 Foreign relations 4 Indians of North America 4 Populism 4 Public opinion 4 Relations 4 Slavery 4 Social conditions 4 Democracy 3 Economic development 3 Emigration and immigration 3 Ethnic relations 3 First contact with Europeans 3 Foreign economic relations 3 Frontier and pioneer life 3 Historiography 3 less ...