The Kent State Killings is another tragedy which also helped lead to Nixon's resignition. On May 4, 1970, the Ohio National Gaurdsmen were on the campus of Kent State University and they were in the middle of a protest. The protest was over the invasion in Cambodia that president Nixon insisted must happened. They obviously were furious with what Nixon was doing and they thought that they should express themselves through protest. They begun their protests a couple of days earlier and things were getting out of hand. They had begun using violence such as throwing rocks, setting bonfires, and other things of that manner. So on May 2, 1970, the National Gaurd was sent to stop all of that but eventually, it got out of hand. On May 4, 1970, four students were shot and killed, nine others were injured.