Discoveries in geography 39 Discovery and exploration 39 History 36 Explorers 30 Spanish 27 Colonies 17 Indians of North America 10 more ... Enslaved persons 7 Slavery 7 Description and travel 6 History and criticism 6 British colonies 5 Historiography 5 Indians, Treatment of 5 Knowledge and learning 5 Administration 4 French 4 Historians 4 Politics and government 4 Travel 4 Admirals 3 Authors, American 3 Black people 3 British 3 College teachers 3 First contact with other peoples 3 History, Naval 3 Naval history 3 Slave narratives 3 Women historians 3 less ...