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> Can I be transwhite if I'm a mongrel :^):^):^)

Doesn't pass #1. Whites can plainly see a mud isn't white. Isn't it amazing how two simple common sense rules solve all mutt trolling?

Your questions were answered.

> Am I mixed?

Yes, because you did not self-identify as white.

> Are Greeks/Slavs/South Italians/Spaniards/Argentinians white?

Depends on the Greek and if their ancestors got raped by Turks or not.

You could have figured out the answer to those on your own.