1917 CE

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; The Halifax Explosion devastates the Canadian port city when a munitions ship detonates, killing nearly 2,000 people and leveling much of Halifax.

In the 1910s, the 20th century.