Explorers – Lesson PowerPoints include tons of vocabulary, people, events, and ideas for teaching about Explorers from an American History context. Topics covered include The Silk Road, Marco Polo, African Trading Empires and Routes, Vasco da Gama, Bartholomeu Dias, Navigation Technology, Vikings including Eric the Red and Leif Ericson, Christopher Columbus and the controversy that comes with him, Amerigo Vespucci, the Search for a Northwest Passage, John Cabot, Henry Hudson, Jacques Cartier, Sa