I'm not at all sure what you are upset about, JWC.
I'm assuming that there has been a story in the media about some "first". Do you have a link?
Not all cultural divides follow the borders of nation state system, which as I understand it, was historically devised to divide Europe, and eventually the entire world, along European ethnic lines.
There are cultural commonalities shared by people of different countries, and regional cultural differences within single countries.
As far as language goes, language is no trivial matter when it comes to cultural similarities and differences. Having a common language facilitates communication and the transmission and sharing of culture.
One thing that Puerto Ricans and Mexicans might have in common could very well be an appreciation for Cumbias, a genre of Colombian music, to name just one example.
What do Black Iowans and Black New Yorkers have in common, besides the English language?