Germans in America, that is. We forget that before there were Mexicans, there were Germans. The great immigration threat from Benjamin Franklin's time until late in the 19th Century came from Germans, who were largely responsible for settling the midwest in force. Much of the discussion about immigration policy was driven by the nature of German immigration. In fact, today, there are more Americans of German descent than of any other nationality.
Barzun, in his affectionate mid-century discussion of American society, culture, and the American role in the world, God's Country and Mine, writes:
Our popular culture Germanic? Yes. It is not merely that at Christmas time we all eat Pfeffernusse and sing "Heilige Nacht," nor that our GIs in the last war found ever country queer except Germany....
One could go on forever; our appalling academic jargon bears a deep and dangerous likeness to its German counterpart; our sentimentality about children and weddings and Christmas trees; our taste in and for music; our love of taking hikes in groupsm singing as we go; our passion for dumplings and starchy messes generally, coupled with our instinct for putting sweet things alongside badly cooked meats and ill-treated vegetables - all that and our chosen forms of cleanliness (every people is clean in different ways about different things) show how far a characteristic culture has spread from the three or four centers where Germans first settled.
I had never thought about this before, but it has the ring of truth for his time, although by the 70s many of these cultural preferences were already passing from scene, driven out by natural cultural change and, at least in the case of food, the nascent Health Fascists.
While Barzun plays it down a little, it's clear that the influx of Germans, to be German-Americans, who published German-language newspapers as late as WWI, essentially took over American popular culture. But because of effective assimilation and instruction in civic duty, we have so far not fallen prey to the catastrophic European "isms."
Barzun himself was a naturalized American, having come here from France as a student at Columbia in the 20s, gained citizenship in the 30s, eventually rising to be dean at Columbia. He was considered one of the century's great public intellectuals, and published a massive survey of Western culture as recently as 2000, at age 93.
His star has dimmed somewhat over the last couple of decades, probably because he devoted time to university administration as much as writing, and because his writing was all over the map. His best-known work is probably the frequently-updated Modern Researcher. He published on race, William James, European and American history, Leftism, Romanticism, and of course, academia.