History 110 Colonies 53 Slavery 26 Slave trade 18 Discovery and exploration 12 Relations 12 Civilization 11 Emancipation 11 Indians of North America 11 Slaves 11 Politics and government 9 Slavery in literature 9 Social conditions 8 Foreign relations 7 Administration 6 Colonization 6 Commerce 6 First contact with Europeans 6 History and criticism 6 Blacks 5 British 5 Emigration and immigration 5 French 5 Government relations 5 Race relations 5 Spanish 5 African influences 4 Economic aspects 4 Economic conditions 4 European influences 4