History 221 Discovery and exploration 154 Colonies 130 Indians 63 Spanish 53 Antiquities 36 Administration 27 Politics and government 25 History and criticism 23 Slavery 23 Explorers 22 First contact with other peoples 22 British 21 Description and travel 21 Indians of North America 21 Civilization 19 Ethnology 18 Commerce 17 Indians, Treatment of 17 Slave trade 16 Human rights 15 Foreign relations 14 Colonization 13 Historiography 13 Sources 13 Congresses 12 In literature 12 Black people 11 Influence 11 Social conditions 11 Norse 10 Causes 9 Imperialism 9 Origin 9 Relations 8 African Americans 7 Europeans 7 Intellectual life 7 Public opinion 7 Race relations 7 Social aspects 7 American influences 6 Early works to 1800 6 Emigration and immigration 6 European influences 6 French 6 Indians of South America 6 Travel 6 Voyages and travels 6 America 5 American literature 5 Antislavery movements 5 Discoveries in geography 5 Economic conditions 5 English literature 5 Government relations 5 Indian art 5 Indigenous peoples 5 Knowledge 5 Literatures 5 Slaves 5 Study and teaching 5 Art 4 Art, American 4 Bibliography 4 Civil rights 4 Civilization, Modern 4 Climatic changes 4 Diseases 4 Early accounts to 1600 4 Ecology 4 English 4 Ethnic relations 4 Ethnicity 4 Folklore 4 Frontier and pioneer life 4 Indians of Mexico 4 Man, Prehistoric 4 Maps 4 Migrations 4 Periodicals 4 Plantation life 4 Polynesians 4 Population 4 Spaniards 4 Territorial expansion 4 Appreciation 3 Biography 3 Birds 3 Books and reading 3 Buddhism 3 Church history 3 Classification 3 Colonies in literature 3 Constitutional history 3 Effect of human beings on 3 El Dorado 3 Emancipation 3 Explorers in literature 3 Foreign public opinion, British 3