Ask yourself this:  Does he know the USA National Anthem or the German?  If you think he knows only the German national anthem, you need to identify that he's a German.  The kid can barely speak English.  Yes, he has a USA Passport, but that does not make him ONLY an American.  He has a German passport which is identified in the next sentence.  Please be respectful of this and quit arguing the silly point of what FIFA thinks he is. They are not Uebergods on Nationality.  As the articles of the past all indicate (Thomas Dooley as an example), the correct way to do things (as have been done for ages) is to label Green as a German American.  End of story.