Although many historians argue that Germany bears the most responsibility to WWI, being that the Blanc Cheque provided unconditional support to Austria-Hungary, isn't it ironic to argue so? This agreement was agreed on by both sides, not just Germany, and so shouldn't Austria-Hungary bear the same responsibility for the creation of the Blanc Cheque? Even though it's true that without German support, Austria-Hungary would not have reacted so violently to the assassination of Archduke Ferdinand, the truth still remains: Austria-Hungary was the one who declared war on Serbia--and wanted to--Germany was merely offering support in case Austria-Hungary were to need it. Adding on to that, if the blame were to be placed on Germany for the Blanc Cheque, shouldn't the Triple Entente bear the same amount of blame? After-all, all the alliances formed between the European nations during this period could be blamed for the exact same reason.
Germany invading Belgium is also a proposed argument for placing the majority of blame of this nation, however, this event was not a CAUSE for WWI. This event simply provoked Britain to join in the war to protect Belgium, and although it was not justified for Germany to do so, it remains to be true that WWI was not caused by this event. To address when WWI really started and became "worldwide", the war was never truly worldwide in the first place. It was simply a name and title given to the war, and so I would define that WWI started as soon as Austria-Hungary declared war on Serbia. Therefore it is arguable that Austria-Hungary was the one that started the war and deserves the most blame, as they were the first to declare war and initiate WWI. Also, Britain, France, and Russia's actions later on were simply reactive and defensive, and so it is not justified to place most of the blame on them. They were simply intimidated by Austria-Hungary's engagement in war with Serbia (and support from Germany), and with Russia demonstrating its alliance to Serbia by joining the war, France enacts its alliance with Russia by hopping on the bandwagon as well.
To support my argument, I would like to voice my support for and talk about Dr. Heather Jones and Dr. Annika Mombauer. Both express their views on placing equal amount of blame on Austria-Hungary, however, I feel that Austria-Hungary bears more responsibility in starting WWI than Germany. Both argue that the Blanc Cheque is a justification for placing the blame on Germany, however, Germany simply offered support to Austria-Hungary--they were not the ones who declared war on Serbia and initiated WWI. Although Germany does bear a large part of responsibility to WWI, they do not deserve the MOST fault for this devastating war. So you could say I support only partially of their provided arguments, as I do agree with their point that Austria-Hungary is one of the main actors in causing WWI.