The assassination of Archduke Ferdinand was never the "cause" of WWI, but the spark (the casus belli) that set it all alight. World War I had been in the making long before the July Crisis of 1914 and all it needed was an event to start it all. The Algiers Crisis, for example, came very close to starting the war. So if the assassination did not occur, then another event would have started it. By that point, the "War to End All Wars" was simply a matter of when, not if.Aur0ra145 said:The Black Hand seemed to be more than one person. And they lucked out, they weren't even blamed for the war (that much) instead Germany was blamed under Article 231 of the Treaty of Versailles, also known as the "War Guilt Clause."
As for who was "guilty" for the war, all involved parties could be blamed to some degree. But naturally, the victors placed it all on the defeated Germany....and doomed the world to yet another war.