The New York Times has published the Immigration Explorer. It shows — by geography and time period — where immigrants from various countries have settled in the United States over the past 130 years.
I haven’t seen anything that rivals it.
My only disappointment is that, though it includes immigrants from Vietnam, it doesn’t have specific categories for others from different parts of Southeast Asia.
Nevertheless, it will be a very useful resource. I’ll be placing a link to it on my United States History webpage.