Because of the "city on a hill" sound bite, "A Model Of Christian Charity" is one of the formative documents outlining the idea of America. But dig deep into its communitarian ethos and it reads more like an America that might have been, an America fervently devoted to the quaint goals of working together and getting along. Of course, this America does exist. It's called Canada.
I like how Sarah Vowell can make an old and rather tired joke worth one more brief chuckle. Also, at the halfway point, the book as a whole is good at noting both virtues and flaws of the Puritans. It makes a good companion to the sometimes bone-dry Albion's Seed coverage of the same people and time.