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Well no one refers to you as German-American. To be honest if you (people in general) see a fellow looking like our flag waving friend here the first word to come to mind is probable hispanic, mexican, latino etc. Certainly not plain old American, it might one of the before-mentioned prefixes and then American. So it's almost as if we (the established citizens) force them to bond to their culture. It happened with the Irish, blacks, Poles, Italians, etc in the past, so this really shouldn't be so surprising.