The main factor that escalated the onset of war after the assassination of the archduke was ______________.

Question

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The assassination of Archduke Franz Ferdinand of Austria by a Bosnian Serb nationalist in 1914 led Austria-Hungary to issue an ultimatum to Serbia. Serbia's refusal to fully comply with all demands of the ultimatum was a direct cause that escalated tensions and led to the onset of World War I, as it prompted Austria-Hungary to declare war on Serbia.

The Main Factor That Escalated the Onset of War After