Well, I'm not really sure what this has to do with the stuff I said earlier, but I m,ight as well answer your questions since you're asking. I'm not sure what you're referring to when you're asking about "statistics" though.
I can only really speak from vague and likely incomplete memories of personal experience here from the pretty liberal New England, but in elementary school I remember learning about Martin Luther King Jr. and Rosa Parks and the basic history of segregation to a level that you can expect a 2nd grader to understand. Their histories, what they stood for and fought for, why it was important, basic stuff like that.
I even remember everyone having to learn this song in music class, which should give a pretty decent idea of how this stuff was taught (though even compared to the rest of the curriculum the song was kinda dumbed down).
8th grade history also had a unit on the Civil War, of course racism was definitely a relevant part of that unit. The primary focus was definitely on the history, though, at that point knowing "racism is bad" was definitely a given for everyone. Maybe it had nothing to do with the way the class was taught and was just my biases showing through, but I do kind of remember learning about it from a perspective of "the union is the good guys and the confederacy was the bad guys although Robert E. Lee was an okay dude".
When you talk about white supremacy being taught through things such as WWII and colonial history, it's pretty surreal to imagine that. History classes about stuff like the Holocaust were pretty obviously just universally about how terrible they were (although for the most part they were absolutely still taught in an objective "these are the facts of what happened memorize them for the test" kind of way). I remember a lot of formal classroom debates about all kinds of different topics (worker unions, old Chinese philosophies, the ethics of nuclear war, you name it), but one that seems relevant was about Christopher Columbus and whether or not he was a total prick for all the shit he did. People tend to not be big fans of him.
I went to a phenomenally liberal highschool that would, multiple times a year, have events involving speakers to talk about issues involving race or LGBTQ+ or whatever else (including the
Day of Dialogue and the
Day of Silence), but at this point all of this stuff seemed completely normal (and still does), it was just long past the point where the idea of racial and LGBTQ+ equality was just a fact of life. I actually remember an old school newspaper article about Republicans in the school feeling like they were something of a demonized minority among the rest of the students, though maybe they were just economically conservative since I have a hard time imagining socially conservative people running around that place.
I'm a pretty strong believer that a person's upbringing and the people they're around will pretty much determine their political/social/economic stances more than anything, but unfortunately I don't really remember anything specific about this beyond my 2nd grade class learning who Martin Luther King and Rosa Parks were. Everything I listed after that feels like it was late enough to be a symptom, not a cause, though hopefully it still gave some perspective on American curriculums and how the topic of racism may be involved.