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In June,Archduke Francis Ferdinand was assassinated.
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Two sides are formed: Triple Alliance, Austria Hungary, Germany and Italy, Triple Entente: France, Russia, England.
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Italy joined the allies and attacks Austria-Hungary,
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Soldiers from the West and the East clashed.
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Trench warfare (lines did nail to the ground).
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Germany attacked an American ship with a submarine.
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Germany helped Austria-Hungary against Italy.
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The United States declared war on Germany.
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Several treaties were signed with the Peace and Versailles Treaties.
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The war ended with the victory of the allies.