If schools are trying to hide those facts about the Democratic Party, it is part of a broader effort to undermine the teaching of black history in general.
Destroying statues that were put in place in the 50s with the literal intended goal of scaring black people away is not "destroying history." You are either a rube, a racist, or both.
Here's a notion: get the info from a source that doesn't have an entertainment/opinion disclaimer or a known history of posting false stories. It's much harder to argue with news coming from a reputable organization... say some place like The Hill; they're a little right of center but they have a strong reputation for factual reporting... so long as you steer clear of the op/ed section.
But teaching white kids accurate history will make them hate themselves. Why do you assume that white kids will automatically identify with racists and slaveholders instead of white abolitionists and civil rights allies?