Historiography of the causes of World War I  Historians writing about the origins of World War I have differed over the relative emphasis they place upon the factors involved. Changes in historical arguments over time are in part related to the delayed availability of classified historical archives. The deepest distinction among historians remains between those who focus on the actions of Germany and Austria-Hungary as key and those who focus on a wider group of actors. Meanwhile some historians, such as Fischer, maintain that Germany deliberately sought war while others do not. The main distinction among the latter is between those who believe that a war between the "Great Powers" was ultimately unplanned but still caused principally by Germany and Austria-Hungary taking risks, and those who believe that either all or some of the other powers, namely Russia, France, Serbia and Great Britain, played a more significant role in risking war than had been traditionally suggested. Given the catastrophic consequences of the war, and its far-reaching social, political and economic implications, the origins of the war, and in particular who "caused" the war, remain heated questions. Straight after the war Allied historians argued that Germany was solely responsible for the start of the war: a view reinforced by the inclusion of 'war guilt' clauses within the Treaty of Versailles. In 1919, the German diplomat and former Chancellor Bernhard von Bülow went through the German archives to suppress any documents that might show that Germany was responsible for the war and to ensure that only documents that were exculpatory (favorable to the defendant, in this case, Germany) might be seen by historians. As a result of Bülow's efforts, between 1923–27 the German Foreign Ministry published forty volumes of documents, which as the German-Canadian historian Holger Herwig noted were carefully edited to promote the idea that the war was not the fault of one nation but were rather the result of the breakdown of international relations. Certain documents such as some of the papers of the Chancellor Theobald von Bethmann Hollweg which did not support this interpretation were destroyed. Hermann Kantorowicz, one of the few German historians who argued in the 1920s that Germany was responsible for the war, found that the Foreign Ministry went out of its way to stop his work from being published and tried to have him fired from his post at Kiel University. After 1933, Kantorowicz who as a Jewish German would have been banned from publishing, was forced to leave Germany for his "unpatriotic" writings. With the exceptions of the work of scholars such as Kantorowicz, Herwig has concluded that the majority of the work published on the subject of World War I's origins in Germany prior to Fritz Fischer's book "Griff nach der Weltmacht" was little more than a pseudo-historical "sham".