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Which of these was directly responsible for the outbreak of World War I in Europe?

entangling alliances

U.S. imperialism

unrestricted submarine warfare

colonial independence movements

User Jksoegaard
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entangling alliances

User Runner Bean
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The direct responsibility for the outbreak of World War I in Europe was the entanglement of alliances. Serbia, Russia, Hungary, and Germany were all major reasons.
User Swati Aggarwal
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