It was Lincoln's idea to keep 'em separated.  At the end but still during the U.S. Civil War.  He wanted to know how to solve the crisis of house-divided.  The scouts and the spies on both sides wanted to know what kind of deal.

  Carefully recorded for posterity.

  The Union listened.  There were those who would never give up "the fight".

  Be it wrong or right.

  The "fragility of freedom" ....

  like those angel wing pickett fences, and then poof!  The world changes.