Which is a good organizing topic for the post–civil war era?

One good organizing topic for the post–Civil War era would be "Reconstruction," since this was the stage that took place immediately after the war, in which the North tried to "Reconstruct" the South in terms of its economy and social structure.  

Hope this helps!!
~Lena~

  the domino theory states that  if one country in a region came under the influence of communism, then the surrounding countries would follow in a  domino  effect.