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World War 1, known as at the time as the Great War, was a largescale war between the major European powers.
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The United States of America officially announced it was "impartial in thought as well as in action," though later the USA did join the war.
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German U-boats sank the RMS Lusitania, a British ocean liner, killing 1,198, 128 of whom were Americans.
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In an appeal to the Senate, President Woodrow Wilson expressed his hope to end the war in Europe.
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Germany announced that its submarines would attack any foreign vessels sighted in the "war zone" around Great Britain.
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Due to Germany's new policy of unrestricted submarine warfare, the USA cut all diplomatic ties with the country.
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German Foreign Minister Arthur Zimmermann wrote to Mexico to offer US territory in exchange for engaging the USA in battle on the homefront.
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On this day, President Wilson convinced the Senate to join the Great War in Europe.
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On this day, the Senate and the House of Representatives both formally agreed to declare war on Germany.
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The United States of America contributed toward the end of the Great War.
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The USA cut diplomatic ties with Austria-Hungary, one of the main enemy nations.
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Bulgaria cut diplomatic ties with the United States.
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The Committee on Public Information was formed by the US government to spread war propoganda to the American people.
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Turkey, an ally of Germany's, formally cut all diplomatic ties with the United States.
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All men in the US between the ages of 21 and 30 were required to sign up for the draft due to President Wilson's Selective Service Act.
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The Espionage Act made interfering with the war effort or supporting the enemy a punishable crime.
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On this day, the first American troops began to arrive in France to join the war.
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After declaring war on Germany, the United States also formally declared war on Germany's ally: Austria-Hungary.
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President Woodrow Wilson presented his 14 points, which he believed could essentially be a blueprint for world peace.
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The Sedition Act outlined harsh punishments for those who disobeyed the Espionage Act.
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Four thousand American soldiers captured the town of Cantigny under the command of Major-General Robert Lee Bullard. This extended the front by about a mile.
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The Battle of Belleau Wood, part of the Allied response to the German Spring Offensive, was the first WWI battle in which the American marines fought.
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After spending over twenty days clearing Belleau Wood, American marines declared the territory had been conquered.
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As part of the Second Battle of the Marne, American and French forces fought Germans in the Battel of Château-Thierry.
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General John J. Pershing lead the first American offensive attack on the Germans in the Battle of Saint-Mihiel.
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After only a few days, the American and French forces had cleared out German occupants in the area.
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The French and American troops once again attacked German troops as part of the three-pronged Meuse-Argonne Offensive.
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On the eleventh hour of the eleventh day of the eleventh month, Germany officially surrendered World War One.
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The Battle of the Argonne Forest concluded with the German surrender and the end of the Great War.
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For just over a year, the Allies and the losers hammered out various treaties to settle the problems caused by the war.
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After months of discussion, the Treary of Versailles was signed. This treaty forced Germany to accept all blame of the war as well as many other retributions.
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