You cannot possibly understand the rise of the white supremacist movement in the U.S. today, without understanding its historical antecedents. This is why we teach U.S. history.
Our past, while painful, has value only in that we cannot progress from it without this knowledge. The teaching of history should never be politicized whether it is popular or painful. The scourge of mistruth, lies, and outright “cancellation” needs to stop at the schoolhouse door.