Eric Foner, a winner of the Bancroft Prize and the Francis Parkman Prize, is the DeWitt Clinton Professor of History at Columbia University and a member of the American Academy of Arts and Sciences. His books include <i>The Story of American Freedom </i>and <i>Politics and Ideology in the Age of the Civil War. </i>He lives in New York City.<br><br>Joshua Brown is the executive director of the American Social History Project/Center for Media and Learning at the Graduate Center of the City University of New York. His books include <i>Beyond the Lines: Pi...