To conclude our series on the origins of World War I, we trace how combat broke out on three different continents in the late summer and fall of 1914, and then examine the various real and imagined causes of the Great War, from the Anglo-German naval rivalry to French revanchism, and finally consider the deeper transformation in the idea of sovereignty in the West that gave a feud between an old empire and a new nation-state in the Balkans the power to ignite a global war.

Image: Mehmet Pasha Sokollu Bridge, Višegrad, Bosnia, with section destroyed, 1915.

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