Beat me to it. I have ancestors generations back who were German, some who were Welch, and some who were Irish. I like sausage, I adore choral singing, and I have red hair. And I am an American. I owe no coin to where my people once were, and I give no honor to what was by inventing for myself a "dashed American" status.
Hey, Mr. Dressed-Like-Somewhere-Else, you go right ahead and do it. You wanna be proud of who your people were a bazillion years ago, fine. But if you act like "you aren't from around here" on purpose, not everyone will agree. The great thing about America is that we have the freedom not to like you, and that we are not yet compelled by law to pretend that we think whatever ideas you hold dear are just as good as the ones we love in our own brainpans. (At least, not outside of our socialist-run schools, anyway.)
I defend your right to act like a complete and utter foreigner, but be warned, not everyone you meet will think that is a good thing.
They “cling” to their religion (and culture).