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June 28, 1914. Archduke Franz Ferdinand was assassinated in Sarajevo. I think you know what happens next. (spoiler: war is unavoidable)

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On August 1st and 3rd 1914, Germany declared war on Russia and France. This later led to Britain joining.

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On the 4th of August, 1914, German forces crossed through Belgium to get to France. This violated Belgium's neutrality and made Britain rather angry.

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The Battle of Jutland occurred from May 31 to June 1, 1916. It was the only major naval battle between German and British naval forces. It saw the introduction of the Dreadnought.

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The Gallipoli invasion was a major defeat for the Allies during WW1. It went from February 15, 1915, to Jan 9, 1916. British casualties were around 120,000. The French incurred 27,000 casualties and a Turkish figure, while uncertain, is thought to be over 220,000.

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The  Zimmerman Telegram - January 17, 1917

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The  Zimmerman Telegram - January 17, 1917

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British signals intelligence intercepted and decrypted a coded German telegram from German Foreign Secretary Arthur Zimmermann that was intended for Germany's ambassador to Mexico. This was supposed to pit Mexico against the United States.

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On May 7, 1915, the German submarine U-20 torpedoed and sank the Lusitania, a swift-moving British cruise liner traveling from New York to Liverpool, England. Of the 1,959 men, women, and children on board, 1,195 perished, including 123 Americans.

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The Treaty of Brest-Litovsk was a peace treaty signed on March 3, 1918, between the new Bolshevik government of Soviet Russia and the Central Powers (Germany, Austria-Hungary, Bulgaria, and the Ottoman Empire), that ended Russia's participation in World War I.

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The Russian Revolution - March 8, 1917, to June 16, 1923

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The Russian Revolution - March 8, 1917, to June 16, 1923

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The Russian Revolution was a period of political and social change in the Russian Empire, starting in 1917. This period saw Russia abolish its monarchy and adopt a socialist form of government following two successive revolutions and a bloody civil war.

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The Treaty of Versailles - 28 June, 1919

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The Treaty of Versailles - 28 June, 1919

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The Treaty of Versailles was the primary treaty produced by the Paris Peace Conference at the end of World War I. It was signed on June 28, 1919, by the Allied and associated powers and by Germany in the Hall of Mirrors in the Palace of Versailles and went into effect on January 10, 1920.

This brought an end to the Great War, but led to WW2.