Employing historical reenactments, computer imaging, archival photographs and interviews with historians, along with a sensible and balanced narration, “The End of the Civil War” is a well-made documentary on the last chapters of America’s most defining conflict. The first of four episodes recounts Sherman’s march to the sea, a daring, decisive and destructive coup that involved many human rights abuses yet shortened the war and freed many slaves. History turns on such paradoxes.