The later waves of immigration are discussed, and Woodard's contention is that the newer arrivals migrated to areas that were in keeping with their value systems. He also notes that immigration was very concentrated in just a few areas. So, for example, while the Irish were able to change Boston somewhat, they didn't spread out into the interior of New England, and in any event they ended up assuming the ethos of the surrounding people, especially as they made efforts to integrate.
Similarly, the Italians mostly stayed in the New Netherland area, which was more welcoming to them than other parts of the country would be.
Ultimately, voting patterns seem to support his notions.
I think the far better book is probably Albion's Seed, which focuses more on the early period of settlement but in more depth and with more thoroughness.
ἡ δὲ κἀκ τριῶν τρυπημάτων ἐργαζομένη ἐνεκάλει τῇ φύσει, δυσφορουμένη, ὅτι δὴ μὴ καὶ τοὺς τιτθοὺς αὐτῇ εὐρύτερον ἢ νῦν εἰσι τρυπώη, ὅπως καὶ ἄλλην ἐνταῦθα μίξιν ἐπιτεχνᾶσθαι δυνατὴ εἴη. – Procopius
Ummaka qinnassa nīk!
*MySmiley*