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Most of europe was at war
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By the middle of 1914, Europe was close to war
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Austria-Hungary ruled Bosnia and Herzegovina.
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A Bosnian student, supported by group of Serbian terrorist, assassinated him.
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Austria-Hungary declared war on Serbia
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Italy having chapped sides joined the allies
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Germany announced it would attack all neutral ships headed to britain.
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Germany announces unrestricted submarine warfare
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The allies had stopped supplies from going to Germany.
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Allies had defeated Bulgaria and Turkey
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Germany asked the allies for an armistice
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Germany surrendered and a peace treaty was signed