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The standard shorthand for WWI's causes is the MAIN acronym: Militarism, Alliance systems, Imperialism, and Nationalism — but historians debate their relative weight. By 1914 Europe's major powers had been engaged in an arms race for decades, particularly the Anglo-German naval rivalry. A dense network of alliances (the Triple Entente of Britain, France, and Russia vs the Triple Alliance of Germany, Austria-Hungary, and Italy) meant that a localised conflict could cascade across the continent. The immediate trigger was the assassination of Austro-Hungarian Archduke Franz Ferdinand by Gavrilo Princip in Sarajevo on 28 June 1914, which Austria used as a pretext to issue an ultimatum to Serbia. When Serbia's response was deemed insufficient, Austria declared war, activating the alliance chains. Germany's Schlieffen Plan — a pre-arranged strategy to knock France out quickly via Belgium before turning to Russia — brought Britain into the war when Germany violated Belgian neutrality, to which Britain was treaty-bound. Christopher Clark's influential 2012 work The Sleepwalkers argued that all the major powers "sleepwalked" into war without fully intending it; others, like Fritz Fischer, argue Germany deliberately sought a European war.
answered by Omniscientia Team · 193 words · 18 Mar 2026