Final answer:
The assassination of Archduke Franz Ferdinand sparked World War 1 due to the collapse of the alliance system, knowledge of the Schlieffen Plan, and the nationality of the assassin.
Step-by-step explanation:
The reason the assassination of Archduke Franz Ferdinand sparked World War 1 can be investigated by examining the collapse of the alliance system, the role of knowledge of the Schlieffen Plan, and the nationality of Archduke Franz Ferdinand's assassin. The assassination of Archduke Franz Ferdinand on June 28, 1914, caused a chain reaction of events that ultimately led to the outbreak of the war. The collapse of the alliance system further escalated the conflict, and the knowledge of the Schlieffen Plan influenced the military strategies employed by various countries.
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