
There is some of this in the Ezra Klein Vox piece, White threat in a browning America. There are the whites. And there are the non-whites. And never the twain shall meet.
On a side note, Klein’s reliance on social psychological research about white racial anxiety being elicited by priming or information which makes non-whites salient should be critiqued more thoroughly. I suspect most of us find the argument intuitively believable, but the past five years of the replication crisis in psychology, where social psychology was ground-zero, should really make us put our guards up about evidentiary claims which support views we already have a bias toward accepting.

The reason I bring this up is that the different subcultures of the United States have different fertility rates. David Hacket Fischer posits four major Anglo-American streams which date to before the Revolutionary War: New England Yankees, Tidewater and lowland Southerners, Scots-Irish highlanders, and the diverse polyglot Mid-Atlantic region, from Quakers to Dutch. Woodward and others have a somewhat different taxonomy, but the broad sketch aligns.
The curious fact is that up between the 1640s and 1840s New England Yankees were the most fecund of the American Anglo-cultures. The fertility of New England was such that the region began to colonize parts of the United States which had heretofore been dominated by other groups. The eastern half of Long Island was taken over by New Englanders, and they became prominent in New York’s merchant class (there was also a Yankee migration into the Canadian Atlantic provinces). New England farmers swept past the Dutch dominated lower Hudson Valley and overwhelmed the rest of upstate New York, creating a cultural fission that persisted up to the Civil War between the pro-Southern city of New York and the fiercely Republican upstate areas.
In contrast, the population growth rate in the South was depressed compared to the North. Much of this probably can be accounted for by endemic disease.
Things are different now.
