It's at the Carlisle Indian Industrial School (CIIS) in Pennsylvania. I've been there. Most of the persons buried in this cemetery were native American children who died while attending the school. Over 180 are buried at CIIS, and the bodies of many more were sent home to their families.
They were not shot to death by fellow students, but I believe they died for the same reason OUR kids are dying at their schools - the powers that be are trying to turn them into something that's unnatural, and it's killing them.