It was to be the war to end all wars, and it began at 11:15 on the morning of June 28, 1914, in an outpost of the Austro-Hungarian Empire called Sarajevo. It would end officially almost five years later. Unofficially, it has never ended: the horrors we live with today were born in the First World War. The Great War left millions of civilians and soldiers maimed or dead. It also left behind new technologies of death: tanks, planes, and submarines; reliable rapid-fire machine guns and field artillery; poison gas and chemical warfare. It introduced U-boat packs and strategic bombing, unrestricted war on civilians and mistreatment of prisoners. Most of all, the war changed our world. In its wake, empires toppled, monarchies fell, whole populations lost their national identities as political systems and geographic boundaries were realigned. Instabilities were institutionalized, enmities enshrined. And the social order shifted seismically. Manners, mores, codes of behavior; literature and the arts; education and class distinctions-all underwent a vast sea change. And in all these ways, the twentieth century can be said to have been born on the morning of June 28, 1914

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