I knew a highly successful Tort Attorney once who based most of his cases on what I called "ethnic determinism".  For instance, he counted on Irishmen acting like stereotyped Irishmen(whatever he conceived that to be), whether they were multi-generational Americans or Irish citizens. It worked for him in court more often than not, but I believe one's nationalism trumps ethnic determinism.  
For decades, nationalism has been decried by the left as anti-humanist, & therefore anti-American. That's one more irrational, liberal distortion of facts ... & human nature.
I'm all for American Nationalism & putting American interests first.  We American citizens are not the nannies or insurers of the entire world population & we should actively resist all attempts to impose such "duties" on our people. 
Immigration once was a benefit to the USA, but that was then, & this is now. Blessed, though we certainly are, we should focus on our exceptionalism and act to increase its benefits & advantages.