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Archduke Franz Ferdinand is assassinated in Sarajevo. His death is the event that sparks World War I. https://www.shmoop.com/wwi/timeline.html
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Russia mobilizes its vast army to intervene against Austria-Hungary in favor of its ally, Serbia. This move starts a chain reaction that leads to the mobilization of the rest of the European Great Powers, and inevitably to the outbreak of hostilities.
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Germany invades Belgium, beginning World War I. https://www.theweek.co.uk/59782/how-did-the-first-world-war-start
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The Germans fire shells filled with chlorine gas at Allied lines. This is the first time that large amounts of gas are used in battle, and the result is the near-collapse of the French lines. However, the Germans are unable to take advantage of the breach. https://blogs.loc.gov/loc/2016/12/world-war-i-on-the-firing-line-with-the-germans-1915/
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Reacting to international outrage at the sinking of the Lusitania and other neutral passenger lines, Kaiser Wilhelm suspends unrestricted submarine warfare. This is an attempt to keep the United States out of the war, but it severely hampers German efforts to prevent American supplies from reaching France and Britain. https://www.gastongazette.com/news/20160503/today-in-history-germany-agreed-to-limit-its-submarine-warfare
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The Battle of Belleau Wood ends with the final expulsion of the Germans from the wood, which marks the farthest German advance on Paris. The area has changed hands six times during the three-week battle, which has caused nearly 10,000 American casualties. https://www.historyhit.com/what-role-did-america-play-in-defeating-the-german-spring-offensive-in-1918/
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The Battle of Cantigny is the first major American offensive of the war. Though small in scale, the Americans fight bravely and soon go on to larger attacks against German positions. http://www.worldwar1.com/dbc/cantigny.htm
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[The Battle of Belleau] Wood begins as the U.S. Marine Corps attacks the Germans across an open field of wheat, suffering huge casualties https://www.bbc.com/news/world-us-canada-44349213
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[The Battle of St. Mihiel] begins when 300,000 American troops under the direct command of General Pershing fling themselves into the German lines. https://jjpershing.com/
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Kaiser Wilhelm abdicates, ending all German hope for a victory. He and his retinue quietly slip over the border into the Netherlands where he lives out the remainder of his life in relative peace and writes a self-promoting memoir defending his actions in the war. https://en.wikipedia.org/wiki/Abdication_of_Wilhelm_II
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The Armistice of 11 November 1918 was the armistice that ended fighting on land, sea and air in World War I between the Allies and their opponent, Germany. https://www.loc.gov/item/today-in-history/november-11/
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Lloyd George wins British General Election
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The Treaty of Versailles was the most important of the peace treaties that brought World War I to an end. The Treaty ended the state of war between Germany and the Allied Powers. https://www.britannica.com/event/Treaty-of-Versailles-1919
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Allied and German representatives sign treaty of Versailles. The United States signs treaty of guaranty, pledging to defend France in case of an unprovoked attack by Germany. https://www.loc.gov/collections/stars-and-stripes/articles-and-essays/a-world-at-war/timeline-1914-1921/