That certainly happened in the EU, but was not the thrust nor points I was trying to raise with my line of questioning. They were more along the lines of NAFTA v2.0 pros and cons with what has been witnessed in the EU along religious, secular, economic and ethnic lines. Those are the questions I myself am mulling regarding the possible next steps towards continental economic powers, such as those evidenced for the continents of Europe and Africa.
As far as races and nationalism go, look no further than the Arabs in the Middle Eastern countries and the various ethnicities in Asia, where if you don't at least look like a citizen of that country physically, then you aren't part of that country. Chinese don't look like Japanese who don't look like Koreans who don't look like Okinawans who don't look like Vietnamese.
I guess you could say that there's an American race, but that deals more with body language than anything else. I was once told by a Hungarian friend that they could always spot the American, even before the American opened their mouths. It all had to do with posture, eye contact, hand expressions, facial muscles and lines, how they walked, how they stood and sat with the airs of hunger, pride and aggression thick around them.
Seems I've meandered yet again. Time to mull some more on the possibility of the NAU.