Jay Gitlin is a senior lecturer in history at Yale University. He is the author of The Bourgeois Frontier: French Towns, French Traders, and American Expansion. Robert Michael Morrissey is an associate professor of history at the University of Illinois. He is the author of Empire by Collaboration: Indians, Colonists, and Governments in Colonial Illinois Country. Peter J. Kastor is Samuel K. Eddy Professor and a professor of history at Washington University in St. Louis. He is the author of William Clark’s World: Describing America in an Age of Unknowns.