Nationalism resulted in a powder keg on the Balkan Peninsula in 1914, and all that was needed was a spark to set it off. What provided this spark and set in motion the events that led to the Great War? Question 4 options: the mobilization of forces by Serbia and Bosnia-Herzegovina the visit of Otto von Bismarck to the Bosnian capital of Sarajevo the assassination of Archduke Franz Ferdinand of Austria the assassination of Kaiser Wilhelm II of Germany.