How would you like it if all you saw in the area where you grew up was more and more foreign people moving in. All the shops change, they speak a different language which is intimidating.
I said I was from Boston. I am guessing from this that you don't know very much about Boston (or about many similar American cities).
Every day on the bus I hear Spanish, Portuguese and Haitian Creole. It is not at all unusual to see people in head scarves in the grocery store or on the street.
This is great!
There is a nightclub I like to go to dance salsa where Spanish and English are spoken interchangeably. It is a mixed crowd where everyone has a great time. In Allston, there are incredible Brazilian and Colombian and Haitian restaurants. My kids have papusas and conch and all kinds of culinary delights that I didn't get growing up in a small town.
I have a friends who are Lebanese Muslims. There is large Armenian community nearby and there is a growing Indian community. I am particularly fond of Dosas.
I am sorry. I don't understand what your problem is.
In my opinion, the difference between the U.S.A. and many other countries is that the U.S. tries to be "inclusive." Historically, and regardless of the EU, many countries are "exclusive," in my opinion. In other words, the concept of "outsider" exists; in the U.S. there are no "outsiders," since all foreigners are believed to be on a learning curve to become Americanized, either them or their children. That I believe is the "story" we promulgate. The U.S. has assimilated generations of immigrants. No reason to believe it will not continue.
And, as a native New Yorker, I like the diversity. I think it is nice that so many different people, from so many different places, wanted a better life in the U.S. And, I believe their children will be good citizens, and make the country a better place. That might be the secret to the success of the U.S.