I have to admit. Despite going to what many people considered a good high school (1970's Bill Fisher era Allderdice) I don't remember hearing about Juneteenth.
As an aside, I don't think high school taught me much of anything, in truth. I regarded it as somewhat of a black hole. Despite The 'Dice's reputation, academic and otherwise at the time, it didn't seem to serve me well. I ended up in the lower half of my graduating class. Whether it was the school's fault or my fault may be up for debate. Probably a little of both.
But aaanyway, I don't remember Juneteenth being part of my American history class. It's sad that such an important date in history, like so much of black history, doesn't get taught in our schools. We read about slavery, and how it is eradicated. Don't remember being taught much about Jim Crow, we read about Martin Luther King and the high points of the Civil Rights Movement, and after he was assassinated...bupkes.
Admittedly, this was 40 plus years ago and while my long term memory is pretty good, my high school years were more memorable about what happened outside the classroom as opposed to inside them.
But like it or not, black history is American history. And it deserves more exposure to our youth than just a rehash of the high points. They need to know about what set up the high points.
But there is so much history of all the peoples that make up this country that is a part of American history and that deserves to be told, and only so much can be crammed into 180 school days. How do you fit it in? How do you make sure that no people's history gets short shrift. I don't know.