"The Great Triumvirate: Webster, Clay, and Calhoun" is a biography written by Merrill D. Peterson that delves into the lives of three prominent figures from the United States in the 19th century. The book explores their roles during the Civil War period and their contributions to American politics and history. Published by Oxford University Press in 1988, this trade paperback features illustrations and is a reprint of the original publication. With 582 pages, this book provides a detailed account of the Great Triumvirate's impact on the United States during a tumultuous time in its history.