History 108 Colonies 57 Slavery 28 Discovery and exploration 24 Slave trade 20 Politics and government 14 Relations 14 Indians of North America 12 Civilization 11 Emancipation 11 Slaves 11 Foreign relations 9 Slavery in literature 9 Social conditions 8 Administration 7 Spanish 7 Colonization 6 Commerce 6 First contact with Europeans 6 History and criticism 6 Indians 6 Race relations 6 Blacks 5 British 5 Emigration and immigration 5 Government relations 5 African influences 4 Early accounts to 1600 4 Economic aspects 4 Economic conditions 4