Civil War Op-Ed

There was a great editorial in the New York Times (NYT) yesterday about the Civil War. I'm embarrassed at how little I know about our country's history in that regard. I'm going to read about it now. I would love any recommendations on good books to get me started. All I really know right now I learned from Gone with the Wind and the Ken Burns mini-series (which I was transfixed by, and still am haunted by the music and the letters).