"[some historians suggest] that traditional immigrant catholicism contributed to changing the definition of "america" from a nation of anglo-saxon protestants to a culture of diversified regions and peoples."—julie byrne, historian what does this quote suggest about "americanization"?

This quote suggestions that "Americanization", rather than a form of assimilation into a homogeneous culture as some would have it appear to be, is in fact an act which has been in a state of national evolution since even the early days. Indeed, the influence of the Catholic immigrants upon the incumbent Anglo-Saxon protestant culture indicates one of the very earliest instances of this evolutionary shift.