World War I

This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.

On the morning of 28 June 1914, a nineteen year old Bosnian Serb named Gavrilo Princip shot and killed Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife Sophie as their car passed through Sarajevo. It was the second assassination attempt against the couple that same morning; the first, a bomb, had missed. Nobody in Europe expected this killing to become a world war. Assassinations and Balkan crises had been common for years, and every earlier one had stayed local. What made 1914 different was not the act itself but the five weeks of decisions that followed, a sequence historians call the July Crisis. Austria-Hungary blamed the Serbian government for the killing and wanted to punish Serbia decisively, but it feared Russia would intervene on Serbia's behalf. On 5 July, Germany removed that fear by promising Austria-Hungary unconditional support, the so called blank cheque, whatever Austria-Hungary chose to do. Armed with that guarantee, Austria-Hungary issued Serbia an ultimatum on 23 July with terms deliberately written to be unacceptable, including a demand that Austro-Hungarian officials be allowed to conduct their own investigation inside Serbian territory. Serbia's reply conceded nearly everything except that one clause, an extraordinary act of restraint that Austria-Hungary rejected anyway. On 28 July, exactly a month after the assassination, Austria-Hungary declared war on Serbia. Russia, seeing itself as Serbia's protector, ordered general mobilization on 30 July. Because Germany's own war plan depended on defeating France quickly before Russia's larger army could fully mobilize, Russian mobilization looked to German generals like the war clock had already started. Germany demanded Russia stand down; when the deadline passed unanswered, Germany declared war on Russia on 1 August and on France on 3 August. The final step brought Britain in. Germany's war plan required marching through Belgium to reach France, violating an 1839 treaty guaranteeing Belgian neutrality that Britain itself had signed. Germany invaded Belgium on 4 August; within hours Britain declared war on Germany, and with the British Empire's entry a Balkan quarrel between two second and third rank powers had become a war among every major power in Europe, all within five weeks of a single shooting in a provincial city few outside the region had heard of. What turned a local killing into a global catastrophe was not any single villain but a system: rigid alliance commitments, war plans built around inflexible mobilization timetables, and leaders who each judged that backing down would cost more than fighting.

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.