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Archduke Franz Ferdinand was assassinated. Archduke's death was the major event that sparked the beginning of WWI.
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Germany invaded belgium, which was the start of world war 1
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Germans fire shells full of chlorine gas. This almost results in the collapse of the french lines.
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A German submarine sinks. The submarine was carrying 1,198 people. 128 of those people were Americans.
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Because of the Lusitania sinking, there were international outrages. These outrages caused Kaiser Wilhem to stop unrestricted submarine warfare.
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The British began using the first tanks ever used in battle.
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Germany brings back the unrestricted warfare in European waters. This event is what drew the U.S. into the war the most. This all caused the defeat of Germany.
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President Wilson declared his case for war to the congress
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Congress authorizes the declaration of war against Germany. The United States enters the war on the sides of Britain and France.
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Congress passes the Selective Service Act which created and authorized the draft of soldiers. Many people disagreed with this act. President Wilson signed this bill into law, seeing that there were no other options.
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Germans sign a peace treaty with the government of Russia. This gave some advantages to Germany, which caused some problems for the French, British, and Americans.
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The battle of Cantiggny was small, but was the first time the Americans were put into a major offensive position. They soon went on to larger attacks against Germany.
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The US Marine Corps attacked the Germans in open fields of wheat, suffering huge casualties. This is what began the Battle Of Belleau Wood.
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300,000 American troops went into the German lines under the command of General Pershing. This is what began the Battle of St. Mihiel.
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Kaiser Wilhelm abdicates, which ended any hope that the German's had for victory. Wilhelm left to the Netherlands to live out the rest of his life. Later came Armistice Day, which ended fighting on the Western Front.