1917
From top to bottom, left to right: The Zimmermann Telegram reveals Germany’s secret offer to Mexico, helping push the United States into World War I; the Russian Revolution sees the fall of Tsar Nicholas II and the rise of Vladimir Lenin’s Bolsheviks, beginning the Russian Civil War; France’s Nivelle Offensive fails, causing huge losses and mutinies; the Battle of Passchendaele inflicts over half a million casualties in Flanders with little gain; the Battle of Jerusalem ends with British capture of the city from the Ottoman Empire; and the Halifax Explosion devastates the Canadian port city when a munitions ship detonates, killing nearly 2,000 people and leveling much of Halifax.
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1917 (MCMXVII) was a common year starting on Monday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1917th year of the Common Era (CE) and Anno Domini (AD) designations, the 917th year of the 2nd millennium, the 17th year of the 20th century, and the 8th year of the 1910s decade. As of the start of 1917, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.