From the May 29, 2017, Chicago Tribune political cartoon by Signe Wilkinson, Philadelphia Daily News.
A picture of a cemetery with a mass of gravestones. All have U.S. flags and each one has a different name on it:
Puerto Rican American
And, so forth.
Pretty-well sums it up, even if I could do without the country classification and just say "American."
We're All Americans.