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Russia begins mobilizing its forces in defense of Serbia, escalating tensions
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Britain declares war on Germany in response to the invasion of Belgium
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The heir to the Austro-Hungarian throne is assassinated by Gavrilo Princip in Sarajevo, triggering a chain reaction that leads to the war.
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Austria-Hungary declares war on Serbia, beginning the escalation of the conflict.
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In response to Russia’s mobilization, Germany declares war on Russia
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Germany declares war on France as part of its strategy to invade France via Belgium
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Germany invades Belgium, violating its neutrality, prompting Britain to declare war on Germany
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Allied forces stop the German advance into France, marking a significant turning point early in the war (September 6–12, 1914)
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The first battle of Ypres takes place in Belgium, with heavy losses on both sides (October 19 – November 22, 1914)
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Allied forces attempt to secure a route to Russia through the Dardanelles, but are defeated by the Ottoman Empire (April 25, 1915 – January 9, 1916)
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One of the longest and bloodiest battles of WWI, with over 700,000 casualties (February 21 – December 18, 1916).
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One of the largest battles of the war, with over one million casualties, it marks the first use of the tank in warfare (July 1 – November 18, 1916)
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The Russian Revolution leads to the overthrow of the Tsarist government and the rise of the Bolsheviks under Lenin (March through November 1917)
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The United States declares war on Germany following unrestricted submarine warfare and the Zimmermann Note
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Also known as the Third Battle of Ypres, it results in heavy casualties and gains little ground for either side (July 31 – November 10, 1917)
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Germany launches a series of offensives on the Western Front in a last-ditch attempt to win the war
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Soviet Russia exits the war, signing a peace treaty with the Central Powers
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The peace treaty officially ends the war, placing heavy reparations and territorial losses on Germany
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The Allied forces, bolstered by American troops, successfully repelled the last German offensive (July 15 – August 5, 1918)
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An armistice is signed between Germany and the Allies, ending the fighting on the Western Front