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The archduke had been the heir to the Hungarian throne. Due to the assassin being Serbian, this led to Austria going to war with Serbia after they refused to abide to all of the demands Austria made.
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Because of the heir's assassination, Austria is set on battling Serbia, triggering Serbia's ally, Russia, to join in.
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The battle then begins with the Western Front.
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In the east, Russian forces invade Germany.
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The Allies attacked the Germans northeast of Paris, in the valley
of the Marne River. -
The British begin a naval attack to capture the Gallipoli peninsula.
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Each side was taking advantage of new tools of war; all this new technology did was kill huge numbers of people more effectively
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In an effort to relieve pressure on the French, the British Army attack the Germans, having over half a million casualites on each side.
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Germany announces that any ships around Britain will be sinked without warning.
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Communist leader Vladimir Ilyich Lenin seizes power of Russia to end his country's involvement in the war.
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This ends the war between them.
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The Allies succeed in beginning to overtake Germany. This leads to the Central powers beginning to crumble and the decline of the war.
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Kaiser Wilhelm and Marshal Foch sign an agreement to stop fighting.
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The allied powers and central powers reach a compromise after four years of war and five years after the heir to the Hungarian throne was assasinated.