‘The Vast Enterprise: A New History of Lewis & Clark’ by Craig Fehrman“Do we really need another book about the Lewis and Clark expedition?” asked Andrea Wulf in The New York Times. The answer, after reading Craig Fehrman’s new page-turner, is “an emphatic yes.” One reason for its novelty is that, in revisiting Meriwether Lewis and William Clark’s westward trek into the newly purchased Louisiana Territory, Fehrman has shifted focus away from the…