Really interesting. I can recommend ‘Battle Cry of Freedom’ by James M McPherson if you haven’t read it already. A wonderful study of the civil war but also excellent background to the development of modern America.
I have H R McMaster's "Dereliction of Duty" lined up on my Kindle. Sadly, McMasters ended up supporting the invasion of Iraq that suggests to me he didn't really learn the lessons of Vietnam all that well.
Hulloutpost's view that any history older than 5 years is irrelevant to political discourse is completely blown away by the role the American Civil War plays in American history right up to the current day.