Robert Putnam, of "Bowling Alone" fame, ponders immigration in this
interview. Here's a quote:
"In the successful cases [of societies integrating immigrants] – like the United States, like Canada, and to some extent Australia – the first step is that the immigrant groups often form organizations on their own: the sons of Ireland or the sons of Norway. Now those may look initially to the receiving society like, “Oh, they don’t want to join us, they want to have their own separate group.”
But what’s going on is that these people are in a new place and they’re trying to find some group with which they have something in common and can begin to form friendships –any of us would do that in a new setting. Those organizations historically prove to be steps toward becoming involved in America."
One thing he misses, I think, is the way we (the natives/earlier immigrants) and they (the later immigrants) start the process. It's true now, and I'm pretty sure it's been true since the beginning, that people in the "old country" were identified more by the sections/provinces they came from. The Irish and the Scots and the Scots-Irish all had county, clan, or religious affiliation. The "Germans" were Hessians, Bavarians, Saxons, or whatever. Once they arrive here, their national identity becomes the major factor, the regionalisms are subordinated. So too today, natives of Indian states become at least "Indians", if not South Asians (along with Pakistanis, Bangladeshis, and Ceylonese) or even "Asians", as in an "Asian-American society.
This leads naturally to a blending of identities--when I was growing up you had the WASP's, the Irish and Italian Catholics, and the Eastern European Catholics. Now we're mostly just "whites".