Who is more important Franz Ferdinands death or World War 1?
The two go hand in hand, the assassination was the short term cause of the war. When you look at the war as a whole there were numerous long term causes such as the militarism, building alliances and imperialism of the major European powers of the time. So the was waiting to happen and the assassination of Franz Ferdinand was just the spark that ignited the fire, the war probably would have happened without the assassination but the assassination would not be as well known had it not started the war.