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The First Battle of the Marne begins. Trench warfare begins as soldiers on both sides dig in .
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The Second Battle of Ypres begins. It is during this battle that the Germans first use poison gas.
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Russia signs the Treaty of Brest Litovsk, which is a peace treaty between Russia and the Central Powers.
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The Treaty of Versailles officially ends WWI
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Invasions of Poland by USSR and Germany begins World War II. Most of Poland is taken in days.
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germany invades the USSR opening what becomes known as the western front
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The Imperial Japanese Navy attacks the US Pacific Fleet anchored at Pearl Harbor. Hawaii US enters the war opening the Pacific Theatre.
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Allied Expeditionary Force under Dwight Eisenhower lands on the coast of northern France on what will later be called "D-Day".The "Second Front," that Stalin has been demanding for three years is finally now opened,
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Hitler commits suicide shortly before the fall of Berlin and surrender of German forces in Europe.
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USA develops the atomic bomb and successfully uses it in August to force japan to surrender.