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Archduke Francis Ferdinand of Austria-Hungary and his wife Sophie are shot and killed in Sarajevo.
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Austria declares war on Serbia.
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Serbia has Russia back them up, and Germany responds by declaring war on Russia. Germany warned France to stay out of it, but France backed Russia. As a result, Germany also declared war on France.
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Germany invades Belgium, which causes Britain to declare war on Germany.
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Britain and France pushed Germany back, ruining their hopes for a quick win on the Western Front.
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The Turks joined Central Powers
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Countries first start to use poison gas as a method.
(http://www.ncpedia.org/wwi-technology-and-weapons-war) -
A submarine of Germany's killed 128 Americans.
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By this point, everyone's morale was dropping.
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Germany resumes submarine attacks, angering America.
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Bread riots in St. Petersburg brought own the Russian Monarchy.
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After the submarines start again, the US declares war on Germany.
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Wilson write his "14 Points" which basically gives 14 reasons to end the war, and keep the peace.
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Final showdown on the Western Front.
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After many years, fighting in The Great War is over.