Earlier quoted context omitted.
> often deployed to support anti-immigrant, anti-assimiliationist views. So what? Immigration is optional. The people supporting large-scale migration from countries without functional democracies should have the burden of proving that cultural attitudes salient to democracy are not durable. Even in the U.S., I'm not persuaded that the Anglo-American republic as originally conceived survived the mass immigration of c…
Immigration is core to American identity and America's success. It's one of our core defining values The American that was originally convinced was imperfect and much worse then the America we have today. We literally had slavery and most adults couldn't vote.
What you’re talking about is a 20th century creation. We never tried to be an “immigrant nation”—we were a big open country with no welfare state, and it was favorable for us to allow extensive immigration to populate the continent and displace the native americans.
In the 20th century we accidentally found ourselves with British Americans being a minority then created this idea of an “immigrant nation” to assimilate all the Germans, Italians, etc. But it’s a retcon.