Imperialism Colonies 37 History 37 Social aspects 12 Indians of North America 8 Colonization 7 Race relations 7 more ... Social conditions 7 Attitudes 6 Civilization 6 Frontier and pioneer life 6 Human body 6 Science 6 Ethnic relations 5 First contact with other peoples 4 Historiography 4 Relations 4 Territorial expansion 4 Administration 3 American fiction 3 Colonists 3 Economic aspects 3 Food 3 Food habits 3 Indigenous peoples 3 Ingestion 3 Intellectual life 3 Intercultural communication 3 Military government of dependencies 3 Natural history 3 less ...