I'm a history nut so Albion's Seed by David Hackett Fischer is my current read. It's been around for awhile, but have now just gotten around to reading it.
It deals with American cultural history and the four great waves of English immigrants, where they settled, how their folkways differed in religion and culture, and how the folkways evolved into the distinct American regional differences.
It is a fascinating read, and though it is a tome (900 pages), Hackett Fischer writes in an engaging way. I can't wait to see how these folkways have defined the political landscape.