Answer: The death of the archduke of Austria and his pregnant wife.
Explanation: A group called the black hand had a plan to murder the archduke of Austria because they did not like the way he ruled and so they maded a plan to kill him. they were going to throw a grenade into his car at a festival/parade and kill him they practiced and then when it was time someone bumped the kid who was throwing the grenade and it exploded in the middle of the road. The kid could not open up his vile tht was supposed to kill him and was captured eventually the archduke was driving and one of the memebers of the black hand found him and killed him right then and there.