Clay interviews Craig Fehrman, the author of an important new book on Lewis and Clark, This Vast Enterprise: A New History of Lewis and Clark. Fehrman approaches the great story of the Lewis and Clark Expedition by viewing it through the eyes of the often-overlooked participants: Sergeant John Ordway, Clark's enslaved valet York, and Sacagawea. Rigorously researched and grounded in actual historical discoveries, this book will be essential reading for students of the Lewis and Clark Expedition. In his footnotes, Fehrman begins with a truly remarkable short essay on his methods and historiography. These essays, which amount to 40,000 words, are alone proof that his work needs to be taken seriously. And he's great fun to interview. This episode was recorded on April 9, 2026.