Why would someone want/need to immerse themselves in a culture they will not see again if it means giving up other education? The time spent doing that takes them away from the other cultures they could be absorbing a lot from. In the US the Spanish cultures are not highly educated groups- students will not usually be learning literature but rather basics. The well educated US immigrants tend to immerse themselves in English.
Regarding England. We spent a week this past summer in London and had east European male housekeeping staff that spoke little English. Those young guys were terrible at the basics- forgetting to replace towels, teas, glasses. Life must be really tough at home to go abroad for those jobs. Hotel owned by foreigners (Arab), btw.
This thread pushes buttons. Many varied backgrounds equally valid- pushing current in vogue ones not best (while past practices no better either). Time for Vive la difference! btw- who cares that one’s ancestors are more than first generation- such as xth instate generation or came over on the Mayflower or whose ancestor was famous Y? Immigrants have made this country. Too many resting on past generations’ work and not doing anything.