Mexican and other Latin birthrates fell more than two decades ago. And Mexico, source of 60 percent of Latin immigrants, is now a majority-middle-class country.
Asian immigration may continue, primarily from China and India, especially if we have the good sense to change our laws to let in more high-skill immigrants.
But the next big immigration source, I think, will be sub-Saharan Africa. We may end up with prominent politicians who actually were born in Kenya.
Continued domestic out-migration from high-tax states? Certainly from California, where Gov. Jerry Brown wants to raise taxes even higher. With foreign immigration down, California is likely to grow more slowly than the nation, for the first time in history, and could even start losing population.
Fortunately, governors of some other high-tax states are itching to cut taxes. The shale oil and natural gas boom has job-seekers streaming to hitherto unlikely spots like North Dakota and northeast Ohio. Great Plains cities like Omaha and Des Moines are looking pretty healthy, too.
It's not clear whether Atlanta and its smaller kin -- Charlotte, Raleigh, Nashville, Jacksonville -- will resume their robust growth. They've suffered high unemployment lately.
But Texas has been doing very well. If you draw a triangle whose points are Houston, Dallas and San Antonio, enclosing Austin, you've just drawn a map of the economic and jobs engine of North America.
Texas prospers not just because of oil and gas, but thanks to a diversified and sophisticated economy. It has attracted large numbers of both immigrants and domestic migrants for a quarter century. One in 12 Americans lives there.
America is getting to look a lot more like Texas, and that's one trend that I hope continues.