Historiography History 19 Frontier and pioneer life 11 History and criticism 9 In literature 9 Territorial expansion 7 Frontier and pioneer life in literature 6 more ... American literature 4 Description and travel 4 Indians of North America 4 Literature 4 Frontier thesis 3 In popular culture 3 National characteristics, American 3 African American authors 2 African Americans 2 African Americans in literature 2 Biography 2 Civilization 2 Environmental literature 2 Environmental policy 2 First contact with other peoples 2 Historians 2 Indians, Treatment of 2 Intellectual life 2 Knowledge and learning 2 Pastoral literature, American 2 Public opinion 2 Race relations 2 Realism in literature 2 less ...