I thought maybe the Book of Mormon would be on the list since it spawned one of the largest American-born religious movements and contributed to much of the settlement of the western US. I don't see any religious books on the list though.
Yeah, I was surprised to not see any religious books. That's a good one I hadn't thought of. I was thinking of Pilgrim's Progress by John Bunyan, one of the most popular books ever written by American and probably the most owned book in the country for an era.