Found in the New York Times, by Presidential historian Gene Healy:

"Nominate a blood and soil nationalist, you're no longer speaking in the voice of Theodore Roosevelt" Wait, what? https://t.co/PjsqJhVor3 — Gene Healy (@GeneHealy) July 29, 2016

Yes, if Colonel Roosevelt wasn't a "blood and soil" nationalist, there isn't such a thing. As Peter Brimelow wrote in National Review, back when it was more National that it is now

Here's another take on nationalism, from the mostly Catholic magazine First Things:

It is a scandal for any Catholic to support ethno-nationalism—it violates Church teaching and betrays our history. https://t.co/hKXDxex4vu — First Things (@firstthingsmag) July 28, 2016

The cartoon you see isn't so much about Catholic history in general as it is about Protestant American resistance to Catholic immigration, and the concomitant political influence of Roman Catholic bishops. But modern European nationalism has nothing to do with the Catholic vs. Protestant wars, but is caused by resistance to Muslim immigration from outside of Christendom—a word you don't hear much.

I saw this anti-nationalist First Things tweet because it was retweeted by AsianConservativeMan who wrote: "And the Pope's demand for a flood of murderous rapists into Europe totally accords with Church teaching and history."

In fact, a previous flood of murderous rapists (I. e. Muslims) was what caused a ninth-century Pope to build the still extant wall around Vatican City.