My high school history classes were basically “slavery happened which was bad. Then, Lincoln freed the slaves. Nothing important happened until the Civil Rights Movement in the 60’s when Martin Luther King Jr. gave his ‘I have a Dream’ speech and black people were fully given equal treatment under the law. Then everything was perfect and there were no lingering issues at all.”
Now, I get that high school history classes are time limited. You can’t possibly cover all of US history in 2 semesters. Some things need to be cut/glossed over. I don’t expect a high school class to give a fully accurate accounting of EVERYTHING that happened. At the same time, glossing over all the bad stuff that happened to black people between slavery ending and the Civil Rights movement seems suspect as does glossing over any issues after the Civil Rights movement. (For reference, I was in high school in the early 90’s.)