It was Germany! No it was Austria-Hungary! No! You're all wrong it was Russia!

So who really is to blamed for the start of the Great War? And who is the cause of it? When we received this prompt in class I looked over my notes and immediately went to the thought that Germany was the cause for the war and that Kaiser Wilhelm II was to blame. Almost all of the facts lead to this conclusion. By the fact that Bismark's (German) Alliance system was the cause of this because if there was not an alliance system, there would be nobody backing anyone up and the war wouldn't have escalated like it did. And sure enough a lot of the facts point to the Kaiser to blame because he broke apart the alliance system. He is the one that wanted to make a navy that was a threat to Britain's, he mobilized the military on the borders of all the countries around Germany. Some would like to argue that Austria-Hungary is to blame because they were the ones that wanted to fight with the Serbians. But if it were not for the Germans, and Kaiser, on A-H's side so strongly, A-H would not have challenged Serbia the way they did. However, with much consideration and analysis, my new opinion is that the cause of World War One is the alliance system that Germany created however the blame can be traced to the Austro-Hungarians because of their strong "need" to fight the Serbians. Was anyone elses opinions changed during the class discussion?