James A. Rawley is Carl Adolph Happold Professor of History, emeritus, at the University of Nebraska-Lincoln. He is the author of several books, including "Turning Points of the Civil War" and "Abraham Lincoln and a Nation Worth Fighting For," both available in Bison Books editions. Stephen D. Behrendt is a senior lecturer at Victoria University of Wellington. He has coauthored a data archive of 27,233 slave voyages, "The Transatlantic Slave Trade: A Database on CD-ROM,"