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The assassination of the archduke of Austria-Hungary was the start of Worl War I.
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Serbia joined the war after Ausria-Hungray declared war on them for killing their archduke.
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Austria-Hungary delcared war on Serbia after they assassinated their archduke Franz Ferdinadad.
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France joined the war due to a treaty with Ruissa and helped them fight against Germany.
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Russia Joined the war because they were allies to Serbia
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Germany joins the war because ther were allies with Austria-Hungray.
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Belgium joined the war after Germany invaded their country.
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Great Britian delcared war on Germany after they closed Belgium's ports, posing belgium as at hreat to Britain.
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The Ottoman Empire (AKA Turkey) joined the war because they were allies with Germany.
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Italy declares war on Austria-Hungray after being neutral.
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Bulgaria joined the war on the side of the central powers.
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Germany decalared war on Portugal who were allies with Great Britian.
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Romania declares war on Austria-Hungary.
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Greece joined the war on the side of the allie forces.
