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  franz was assanated by serbians causing tentions between serbia and austria hungary
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  because if tentions with austria-hungary
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  because of the assassition of their archduke
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  because of trades/ alliances
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  because of its trade and relation with serbia
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  because they become invaded
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  also because of alliances
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  because it also has a trade and alliance with A-H
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  because war is coming near its boundrys
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  because of relations with italy
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  because of treade with bulgiria
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  because of both bulgiria and romania