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Germany creates a blockade on Great Britain to prevent shipping on the Allies. Any ship approaching was a target for the Germans to destroy
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German submarines (aka U-Boats) takes down the Lusitania ship and all passengers which consisted of civillians, including 128 Americans.
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Due to America's anger, Germany stops it's submarine warfare.
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President Woodrow Wilson publicly advised Germany to cease with restricted U-Boat warfare
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Germany puts submarine warfare policies back into place. This angered American's because of the dangers for civilians.
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President Woodrow Wilson asks Congress to declare war on Germany
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Troops from the United States experience trench warfare in France
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President Woodrow Wilson introduces his 14 points idea, a plan to create permanent world peace.
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President Woodrow Wilson agrees to send "volunteer" troops to Russia, to assist the White armies in defeating the Reds. This shows a bias that many countries in the Allies shared about the Russian civil war.
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The war ends. Germany and the Allies sign an armistice.