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Gavrilo Princip, member of the Black Hand assassinated Archduke Francis Ferdinand in Sarajevo, Bosnia. This sparked the start of WW1.
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Austria declared war on Serbia. Russia heard about it, and then mobilized their troops.
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Following the Schlieffen Plan, the Germans had been moving toward Paris when the French staged a surprise attack that began the First Battle of the Marne. France and Great Britain defeated Germany. This battle began trench warfare.
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On Christmas Eve 1914, Germany decided to create a truce with their enemies Britain, and to stop the war for Christmas.
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The British passenger ship the Lusitania was sunk by a torpedo from a German u-boat. More than 1,100 passangers parished; 120 of those passengers were Americans.
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The Battle of Verdun was a battle fought on the Western Front between the German and the French armies, on hills north of Verdun-sur-Meusein north-eastern France. France ended up winning , but lost many soldiers. It was one the most bloodiest and longest wars of all time.
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The Battle of Jutland was between the German and British scouting forces. It involved 250 ships and 100,000 men off Denmark's North Sea Coast.
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The Zimmerman Telegram was a coded message sent from Germany to Mexico. It stated that Mexico should ally with Germany in a battle against the Unied States. The British decoded the telegram and the U.S. saw it. That was when the U.S. was first brought into WW1.
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This battle was between the French and American forces on one side and Germany on the other. It was a major victory for Germany.
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Germany signed the armistice in Copeigne, France. The fighting of WW1 ended on the 11th hour, on the 11th day, of the 11th month. Today that date is now known as Armistice Day or Veterans Day.