History Colonies 50 Slavery 25 Slave trade 18 Slaves 11 Emancipation 10 Indians of North America 10 Relations 10 Civilization 9 Discovery and exploration 9 Slavery in literature 9 Social conditions 8 Politics and government 7 Administration 6 Colonization 6 Blacks 5 British 5 Commerce 5 Emigration and immigration 5 Foreign relations 5 French 5 Government relations 5 Race relations 5 Spanish 5 African influences 4 Economic aspects 4 European influences 4 First contact with Europeans 4 Imperialism 4 African Americans 3