Covering such a wide sweep of history you always have to pick and choose. On the whole I liked the choices but you still have to remember that they are choices.
I personally found his recounting of the civil rights rally on August 28, 1963 to be very moving and worth the cost of the book for that section only.
There were other points that I wished I could check his sources. He states about the 2000 Florida that subsequently "a full recount would have awarded Florida's electors to Bush anyway." Wolter, K.M., Jergovic, D., Moore, W., Murphy, J. and O'Muirheartaigh, C. 2003. "Reliability of the Uncertified Ballots in the 2000 Presidential Election in Florida." American Statistician, 57(1):1-14. States just the opposite, that Gore would have won by 107-115 votes if all the votes had been recounted.
My point isn't that he couldn't find sources to support his assertions, but just to remember when reading that this is a popular history not a scholarly work. It reminded me of the works of Frederick Lewis Allen particularly "The Big Change: America Transforms Itself 1900-1950"