I think you made a big mistake, The Catholic Church in the US was shaped to a large extent by the Irish. The first significant waves of Irish immigration began in the early
1800’s, Before that time there were very few Catholics outside of Maryland and areas controlled by the Spanish or French-The South-West, the Louisiana area and Florida.
A good example of this are the earliest Catholic churches in Boston, New York City and Richmond Virginia, all of which date from between 1800 and 1810. As soon as the Irish got settled in the US, they brought over priests to service their communities.
And bear in mind, there was rabid anti-catholic sentiment throughout the United States up until the election of John Kennedy. In the 1840’s there was severe anti-Irish immigration (read anti-Catholic) feeling in the US resulting in the Know Nothing Party. The Irish problem was not resolved until the end of the American Civil War and then only because it was recognized that the North won the war because of the huge number of Irish in their army.
Then you have the enormous Italian, South German (Bavarian) and Polish immigration of the late 19th and early 20th Century. However, by this time the Irish Clergy predominated and controlled the US Church. This very conservative clergy stayed in power until V II, by which time they were thoroughly assimilated into and tolerant of US culture.
All of this coupled with a predominately Irish clergy made for a very conservative, ultra-orthodox Catholic Church pre V II. Then, the libral faction of the Catholic clergy took over post V II and we have what we have now.