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I think it was because of disagreements

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I think it was asasination

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Because they wanted to be better then Avery one there. Nationalism

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I think it was the Assasination.
because it kinda of you already know that when the assignation happened e Verona was gonna jump in.

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Imperialism because if one country wanted to take over another country it would be catistrofic

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Nationalism because if no one can except the fact that one country/kingdom is better than the other, it might cause rage. They would want to show each other they’re better.

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I think the biggest cause of World War One is the asasination on Archduke Ferdinand because the Austria Hungary military was mad because there leader has died