Albion's Seed: Four British Folkways in America by David Hackett Fischer (1989)

 It took me about 6 mos to polish off this one, it was the major reading accomplishment of 2021.  The author talks about the 4 different groups of British settlers in the American colonies- Puritans, Virginians, Quakers and Borderers/ Scots Irish- and their impact on the development of the US all the way to the present.  I permanently changed the way I think about US history.