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A group named "black hand" killed Francisco Ferdinando,
successor to the throne of The Austro-Hungarian, It was the fuse of the war. -
The two blocks Triple Alliance ( Germany, Austria-Hungary and Italy) against Triple Entente (Great Britain, France and Russia) began the war, with movimentation of troos and some attacks.
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Italy changes sides because of they have no more troops and power to be fighting.
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Russia goes out because of their revolution.
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They comes the war to help the Triple Entent, to preservate their investiments.
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Brazil Invites a ship with military who died with Spanish flu.
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Germany signed the surrender.
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Just germany is liable and convinced to suffer the punishment.