Discovery and exploration 27 History 27 Spanish 25 Explorers 10 Indians 9 Politics and government 9 Hispanic Americans 7 more ... Emigration and immigration 5 African Americans 4 Civilization 4 Description and travel 4 Ethnic identity 4 Mexican Americans 4 Race relations 4 Black people 3 Colonies 3 Ethnic relations 3 History and criticism 3 Immigrants 3 Indians of North America 3 Indians, Treatment of 3 Social conditions 3 American literature 2 Antiquities 2 Attitudes 2 First contact with other peoples 2 Government policy 2 Government relations 2 Historiography 2 Mexicans 2 less ...