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- From top to bottom, left to right: The Sinking of the RMS Lusitania by a German U-boat kills nearly 1,200 people, including 128 Americans, heightening tensions between Germany and the United States; the Gallipoli campaign begins as Allied forces attempt an amphibious invasion of the Ottoman Empire, ending in failure; the Armenian genocide starts with the arrest, deportation, and mass extermination of up to 1.5 million Armenians; the Gorlice–Tarnów offensive breaks Russian lines in Galicia, shifting the Eastern Front in favor of the Central Powers; the Second Battle of Ypres marks the first large-scale use of poison gas on the Western Front; and Italy joins the Allies, opening the Italian Front against Austria-Hungary. (en)
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