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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