You haven't met my native white children apparently

That sounds very interesting. Would you mind pointing me to some documented measurements that suggest this so that I can study them?

There are native white populations in the US? And just when I thought I understood how Americans defined the category "white"…

American white supremacists can't figure out a definition of "white". I doubt anyone will ever get a handle on it.

(e.g. do you include Italians? Jewish people? What about Turks or Armenians? Eastern Europeans? There's all sorts of disagreements about what "white" is in the most racist groups out there... because the whole concept is fucking stupid).