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To many ironies around American white supremacists to enumerate. Back in the 19th century, a lot of them called themselves "nativists".
Scottish/Celtic identity is popular with U.S. white supremacists because they see it as not just white but romantically and mystically white. Irish identity not so, because they (the U.S. Nazis) are mostly rabidly anti Catholic.
Braveheart hugely popular with Aryan Nations types.
It's disappointing that they're so 'proud' of their white immigrant ancestors, yet continue to foster a hostile atmosphere to non-white immigrants.