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  Ferdinand and his wife, Sophie, were killed by Gavrilo Princip, on the way to Sarajevo.
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  After Archduke died, Austria-Hungary declared war on Serbia. This was the beginning of World War 1
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  Between the Russian empire and the German empire
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  The trench warfare came into being, and marked the end of the German sweep into France
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  Both sides stopped fighting and celebrated Christmas together
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  The Allies went against the Central Powers
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  The first lord Admiral wanted to attack Turkey, since it was the weaker ally of all central powers.
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  It was full of massacres and many deaths occured.
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  A torpedo was fired into the side of the ship, which led it to sinking.
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  It was to complete a blockade on Germany, which was successful
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  Fought between Germany and France during the First World War on the western front.
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  Brought the end of the war between Russia and Germany
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  The Allied attacked on the western front, with a record of the most kills on the first day,
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  One of the reasons the United States joined the war, Restricted submarine warfare
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  Proposed from the German Empire to Mexico to make war against the United States
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  Russians were discouraged with the outcomes of the war and injuries, so they wanted to get back.
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  Took place on the Western Front and over one million French soldiers had been killed
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  The U.S. joined Britain, France, and Russia to fight in World War 1
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  It was made for peace which later became the basis for peace negotiations
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  The last major war for Germany on the Western Front. It was the turning point in the war in the front
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  A disease that killed more people than the Great War, where 20 to 40 million people died
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  It was the final end of World War 1
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  Trenches on the Western front were in very poor condition, which made living hard for the soldiers
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  It was to negotiate peace treaties between Allies and the Central Powers
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  It forced Germany to give up territories to Czech Republic, and Poland.