The word used for the day the war ended and that literally meant “stop shooting”

Although a number of things brought about world war one there was one even that push to europe over the edge. what was that event?

At the casablanca conference, allied leaders signed an agreement to share military technology decided to launch an invasion of southern france agreed to accept only the unconditional surrender of the axis powers agreed to form a scientific team to create the atomic bomb

Could anything have been done through compromise to stop it, or did it have to happen?