I do not believe I have read a more willfully ignorant post recently than Noah Smith’s post at Bloomberg View, “Demographic Decline Is the Real Threat to the U.S.”. The U. S. has no demographic decline to threaten it. Japan has demographic decline. China has demographic decline. Germany has demographic decline. The U. S. does not.
I have attached links to population pyramids for the countries in question above and you will note that those for Japan, China, and Germany all have something in common: they get skinnier at the bottom. That’s demographic decline.
The United States does have a problem which is the hollowing out of the countryside, completely unrelated to demographic decline. That problem will not be solved by moving immigrants there. The map at the top of the page tells the whole story. Immigrants are moving to where the jobs are not where the land is. I’d be willing to bet that if you moved an immigrant family to Elbing, Kansas (pop. 226) within a 100 hours they would have left for somewhere else. There’s nothing for them to do there.
Now if your concern is about the depopulation of the countryside, something that has been noted for decades, I’d be happy to talk about it. One thing you’ll note about where the population is moving from and to is that state capitols and the counties that surround them along with Washington, DC and its environs are all growing while most other counties are shrinking. Immigration won’t solve that. Solving that will require changes in how tax dollars are spent.
Now if he were to have said that there isn’t enough housing in Seattle, Santa Clara, San Francisco, New York, and Alexandria to accommodate all of the people who would like to move there, then he’d be talking. That wasn’t caused by demographic decline. It was caused by NIMBYism. Policy decisions.