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The 28 of June of 1914 ocurred the  assasination of archiduke of Autria Franz Ferdinand, heir to the Autro-Hungarian Empire.

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The battle of Marne starts the 5 of September and ends the 12 of September.

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Austria-Hungary declared war to Serbia and First Wolrd War started.

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General mobilization in Russia, an ally of Serbia.

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Assassination of French socialist and pacifist leader Jean Jaures.

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Germany declares war on Russia.

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The German invasion begins in Belgium

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Germany delares war on France.

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German troops cross Belgium and enter France. The United Kingdom declares war on Germany.

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Japan declares war on Germany.

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The battle of Marne begins the 5 of September.

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First battle of the Marne. A Franco-British counteroffensive slows the advance of the Germans, less than 40 kilometers from Paris, and drives them back to the north. About a million French and British soldiers face 800,000 Germans.

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The Gallipoli campaign took place in the Gallipoli peninsula and Australian, neozelands and british troops fouhgt against the Ottoman Empire.

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On May 7, 1915, a German torpedo destroyed the Lusitania. More than a thousand people were killed, including 128 Americans, and the incident prompted the United States to enter the First World War.

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Italy goes to war alongside the Allies.

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Russian defeats against Germany

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Landing of an Allied Expeditionary Corps in Thessalonica Bulgaria entered the war on the German side.

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The battle of Verdun started on February and it was the largest and longest battle of First World War on the Western Front between the German and French armies.

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Sykes-Picot Agreements: English and French divide the Middle East.

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British and French forces launched an offensive in the Somme region of northern France. The Battle of the Somme was one of the longest and bloodiest of the First World War, with more than a million killed and wounded.

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The last Austro-Hungarian emperor, Francisco José I., dies.

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Germany launches the submarine war at all costs, which precipitates the breakdown of diplomatic relations with this country by the United States.

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United States enters the war on the Allied side, delarating war on the central powers.

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Failure of the French offensive on the Road of the Ladies, on the Champagne front, which leaves tens of thousands of deaths. French soldiers mutiny. There are also manifestations of discontent in the armies of other countries throughout the year.

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China declares war on Germany.

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British Foreign Secretary Arthur Balfour promises the Zionist leaders a "Jewish National Home" in Palestine.

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October Revolution in Russia, bringing the Bolshevik Communists led by Lenin to power.

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The British enter Jerusalem.

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Brest-Litovsk Armistice between Russia and the Central Empires.

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Declaration of fourteen points by US President Wilson on the right of peoples to dispose of their destiny, which will serve as the basis for the treaties signed after the war. The US military intervention, which takes place as of the boreal spring, will be decisive.

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Germany launches the first of a series of four major offensives on the western front, but the Allies resist.

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Victorious Allied counteroffensive at Villers-Cotterets with massive support from US troops, which marks the beginning of the general retreat of German forces. The Allies are also advancing in the Balkans and on the Eastern Front.

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The Spanish flu spreads in the world causing 20 million deaths in eight months.

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The Austro-Hungarian Empire signs an armistice.

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Autria surrenders leaving the German army without strength.

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The Emperor of Germany, Wilhelm II, abdicates. Major demonstrations in Berlin.

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Germany surrenders to the Allies, thus ending First World War with an Allied victory.