How white do you have to be to be considered white?

In terms of percentages?

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Just asking. I'm half white but people tell me I am "white-passing". My boyfriend claims he is not white, but slavic, despite looking (in my humble opinion, don't kill me for this) very extremely white.

I would say 70ish percent white would categorise you as white, but I'm not sure; that's why I'm asking.
How white do you have to be to be considered white?
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