This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
More than a century after the guns fell silent, historians still cannot agree on who started World War I, and the disagreement is not a matter of missing facts so much as which facts get weighted as decisive. Three readings dominate the debate. The first, the Fischer thesis, takes its name from the German historian Fritz Fischer, who argued in his 1961 book Griff nach der Weltmacht that Imperial Germany deliberately risked and even welcomed a European war to secure continental dominance, pointing to the blank cheque Germany gave Austria-Hungary on 5 July 1914 and to expansive German war aims drawn up within weeks of the fighting starting. Fischer's argument broke a postwar West German consensus that blame was shared equally among the powers, and it provoked what came to be called the Fischer Controversy, one of the bitterest historical debates of the twentieth century, precisely because it assigned Germany a level of responsibility uncomfortably close to the one later attached to the Second World War. The second reading is the structural one associated with the British historian A.J.P. Taylor, whose 1969 book War by Timetable argued that the war followed less from any leader's intentions than from the mechanics of mobilization itself. Every great power's army moved by rail on schedules fixed years in advance; once mobilization began, reversing it meant losing a war winning head start, so leaders who might have preferred to stop found the machinery had effectively taken the decision out of their hands. On this reading the war was closer to an accident of engineering and timetables than a plot by any single government. The third and most recent major reading comes from the Australian historian Christopher Clark, whose 2012 book The Sleepwalkers argues that no single power deserves primary blame, and that Europe's leaders collectively drifted toward catastrophe through misjudgment, poor communication and a failure to imagine how badly a local crisis could spiral, rather than through any one actor's deliberate aggression, hence the title's image of sleepwalkers rather than assassins. None of the three readings disputes the basic sequence of events already established for World War I: the assassination, the blank cheque, the ultimatum, the mobilizations and declarations of war that followed in quick succession through late July and early August 1914. What divides them is how much weight to put on intention versus system, and on Germany specifically versus the great powers as a whole, a question this atlas records as debated rather than settled, because it genuinely is.