D avid Thompson was a monumental figure in North American history. A fur trader, an explorer and perhaps the greatest land geographer ever, he led expeditions through incredible hardship and danger to safety. His 77 journals made important contributions to our understanding of culture, history and everyday life in North America before Europeans brought horses, guns, alcohol and disease. And he and his American Indian wife lived one of the great love stories of all time. So why havenÂ’t you heard of 19th-century frontiersman David Thompson? No doubt one reason is that he spent most of his long life in...