Isn't that pretty much every European group if we're counting at least 1 person from a specific nation?
Bump.
Does 1800’s Irish immigrants who integrated into white American society count?
It all depends upon expectations of Ethnic groups vs. reality of socio-economic stand. Many minorities have successfully represented USA in sports (blacks), in academic research (jews&asians), business (jews&europeans), small business (hispanic) etc.. without much disruption of their traditional living.
However, core American group that contributed more time & resources for development is from NW Europe.
I would say it's not easy, immigrants brought anti-American revolutionary ideas, they helped subvert America by working for the Soviets, their loyalty to me is always in question. If they earn their place here by assimilating and accepting the an American ethos then yes, but there will always be people like Brando in the lot. I think it depends on if they are Northern European or not and have a connection to our philosophy.
https://www.youtube.com/watch?v=rcCKczj4aK4
https://www.youtube.com/watch?v=2QUacU0I4yU