When writing about the Civil War I always marvel that it did not inflict mortal harm on this Republic. That it did not do so, was because many good men and women, on both sides after the War, lived up to the prophetic words of Lincoln, uttered at the end of his First Inaugural Address:
We are not enemies, but friends. We must not be enemies. Though passion may have strained it must not break our bonds of affection. The mystic chords of memory, stretching from every battlefield and patriot grave to every living heart and hearthstone all over this broad land, will yet swell the chorus of the Union, when again touched, as surely they will be, by the better angels of our nature.
This was all put nicely in a conversation that Douglas Southall Freeman, the great Civil War historian, had with his father Walker Freeman, a Confederate veteran who had served in the Army of Northern Virginia, while Douglas was writing his magisterial four volume R.E. Lee.