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June 1914 - Archduke Franz Ferdinand who was heir to the to Austro-Hungarian throne and his wife, the Duchess of Hohenberg, are killed by Gavrilo Princip. This was an important event because after this Austria-Hungary declares war on Serbia and Europe rapidly descends into chaos.

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August 1914 - the Austro-Hungarian government declares war on Serbia. Immediately, and within a period of six days, European countries declare war upon one another.

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Oct 1914 - The First Battle of Ypres was a battle of the First World War, fought on the Western Front around Ypres, in West Flanders, Belgium. It was important because it was one of the first battles to introduce trench warfare which became common along the western front for the rest of the war.

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April 1915 - The Gallipoli campaign was a military campaign in the First World War that took place on the Gallipoli peninsula, from 19 February 1915 to 9 January 1916. it was important because it was a joint British and French operation meant to capture the capital city Constantinople and to secure a sea route to Russia. This failed, with nearly half a million casualties.

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Boats and boating--Equipment and supplies

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may 1915 -  twelve miles off the southern coast of Ireland, she was torpedoed by a German submarine and sank. Of the 1,959 people on board, 1,195 died, including more than 120 Americans. The disaster set off a chain of events that led to the U.S. entering World War I.

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July 1916 - The battle of Somme was a battle fought by the armies  of the British Empire and the French Third Republic against the German Empire. It was significant because the Battle of the Somme was one of the largest battles of World War I, and among the bloodiest in all of human history

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June 1917 - The United States originally wanted to stay Neutral in the war but following the Sinking of the Lusitania with 128 Americans dying public opinion about neutrality started to change, also with the Zimmerman telegram threatening an alliance between Germany and Mexico against America, Wilson asked Congress for a declaration of war against Germany. The United States officially entered the conflict on April 6, 1917. This is a very important part of the war because the United States entering made the eventual defeat of Germany possible.

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July 1917 - The Battle of Passchendaele, also known as the Third Battle of Ypres, was fought during the First World War from 31 July to 10 November 1917. The battle took place on the Ypres salient on the Western Front, in Belgium, where German and Allied armies had been deadlocked for three years. It was important because it added to our nation's growing reputation as having the best offensive fighting force on the Western Front.

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November 1917 - The Bolshevik Revolution, also referred to as the "Great October Socialist Revolution," was the first successful Marxist coup in history. During this chapter of the Russian Revolution, Russia abolished its monarchy and adopted a socialist form of government. It was important because it paved the way for the rise of communism as an influential political belief system around the world.

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June 1919 - The Treaty of Versailles was signed by Germany and the Allied Nations on June 28, 1919, formally ending World War One. The terms of the treaty required that Germany pay financial reparations, disarm, lose territory, and give up all of its overseas colonies.