This varies massively by school or district. I teach history to undergrads, and some of them come in having had entire high school classes on the history of ci

This varies massively by school or district. I teach history to undergrads, and some of them come in having had entire high school classes on the history of civil rights--these students are usually either from majority-black districts, or from elite private schools. Others had history classes that don't even acknowledge that slavery was the cause of the Civil War.