Immigrant patterns are different because it's now possible to easily talk with the “old country,” fly to the old country and more or less stay in constant touch with those in the old country. This didn't exist a hundred years ago. Crap, I remember when a phone call from California to New York was a big deal...Long distance!
We're also seeing immigrants move freely and unapologetically back “home.” A few years ago it Irish guys moving back, now it's Poles leaving.
Immigrant patterns are different
No doubt about it.