River of Enterprise: The Commercial Origins of Regional Identity in the Ohio Valley, 1790-1850Gruenwald's book will make the same contribution to historical knowledge of the Ohio Valley as Lewis Atherton's Frontier Merchant did for our understanding of the mercantile Midwest in the mid nineteenth century. . . . a finely crafted narrative that lets the reader understand that the Ohio River always served more as an artery, that is, a river of commerce, than a dividing line or boundary. R. Douglas Hurt, author of The Ohio Frontier River of