I'm American and 100% northwestern european, if you're white, what are you?

Someone on X is insisting if you're American you can't be European, you're just some admixture of random ethnicities. My family has been in America so long I can't tell you the names of any of the ancestors that immigrated here. Yet my DNA test showed I'm not just 100% northwestern european but 100% Germanic. Scandinavian, German and English.

I'm American and 100% northwestern european, if you're white, what are you?
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