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An underlying cause of World War I was

Athe ongoing dispute over the convoy system.
Bthe web of alliances European nations created for their defense.
Can alliance between the autocratic rulers of Germany and Russia.
DAmerican insistence on neutrality.

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Neuron

An underyling cause of World War I was that B - The web of alliances between the different European nations created for their defense - European nations or rather thier kings were already making strategic partnerships and alliances for a long time since that time to ensure their survival in the long run.

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