I'd be interested in knowing:
a) how many people posting in this thread are from the US; and
b) how many of them have ancestors who migrated to the US from poor countries in the hope of escaping grinding poverty.
I do understand why some people are worried and angry, but these fears are not new. If you went back 150 years, you'd see articles in the yellow press agitating against migration from Southern Europe or some other such place or, of course, against Chinese migration as there was a huge fear that Chinese were "stealing jobs" and taking over, back in the 1850s or thereabouts. There were concerns about recent migrants living in virtual ghettoes and about how they set up their own communities and didn't mix with others and, for the first generation of migrants, that's often true.
I don't see anyone writing about the "yellow peril" and advising against Chinese migration nowadays.