Great book that a reader recommended during my run-up to writing "Great Powers," and it was a perfect suggestion.
The basic thesis: Reconstruction wasn't North reconstructing South, but East integrating West--all according to Lincoln's vision, who front-loaded the process as much as possible with the Homestead Act, RR Pacific Act and so on. He wanted a reconstructed America to be middle-defined--as in, middle America, the middle class, and "men of the West" (which he was). A real eye-opener and beautifully written by Heather Cox Richardson.
I scan through it now and notice the heavy notations I made throughout--always a good sign.