“Foner‘s field of special expertise is what might be called without exaggeration the crucible of American freedom: the Civil War, the emancipation of the slaves and the ambiguous, myth-shrouded period that followed known as Reconstruction. He never puts it this directly, either in this new, somewhat compressed popular history or in his 1988 magnum opus, ‘Reconstruction: America’s Unfinished Revolution, 1863-1877,’ but he sees Reconstruction, with all its contradictions and unrealized possibilities, as the key to all of American history.” Salon‘s Andrew O’Hehir takes a gander at Eric Foner’s latest book, Forever Free.