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Archduke Franz Ferdinand assassinated
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Austria declares war on Serbia; World War I begins.
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Germany enters the war with the Austrians, Russia was allied with Serbia.
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The Allies attacked the Germans northeast of Paris, in the valley of the Marne River.
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First Battle of Marne, First Battle of Aisne, First Battle of Albert, and the Siege of Antwerp
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The
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Tanks were used now.
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Germany Ignores americas warning about the use of Submarines
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