Earlier quoted context omitted.
> The resulting country is also completely ungovernable. Another way to look at it: By any reasonable measure — and for all its indisputable problems — the U.S. is clearly the most successful large, multi-ethnic society in all of human history. Sure, it's always a work in progress. But let's consider the movie, not just the freeze-frame. When people can vote with their feet, it says something that net migration to th…
The US already had the highest standard of living in the world at the time of independence, before it became a multi-ethnic society. The country de Tocqueville wrote about was an overwhelmingly British country. The subsequent trajectory of the US has been one of chipping away at that foundation. The accommodation of vast numbers of immigrants from societies that had no tradition of self government, and little in the…
Let's not forget that (European) immigrants were mostly wanted, so as to provide needed workers. Even the Chinese immigrants of the 19th century were wanted to help build railroads and the like. Racist anti-immigrant factions such as the Know-Nothings and the KKK never really gained the power needed even to try to stop immigration (with the notable exception of the Asian exclusion acts in the late-19th and early-20th centuries).
Scores of millions of Americans, including your servant, are descended from those European and Asian immigrants. Again, the "movie" is that over generations, those people became fully assimilated into American society and values.
As for "accommodating" the immigrants, that brings to mind Heinlein's dictum: Never argue with the weather. It's questionable whether the "British" America of, say, 1787, or even 1868, could have effectively prevented immigration.
We also shouldn't lose sight of the millions of involuntary "immigrants" who were brought here in chains from Africa.