Answer :
The assassination of Archduke Franz Ferdinand, the heir to the Austro-Hungarian Empire, was the catalyst for the conflict.
Why is it called assassination?
Transcript of "A Study of Assassination" The word "assassination" is said to be originated from "Hashish," a substance related to marijuana that Hasan-Dan-Sabah allegedly used to motivate his followers to carry out political and other killings, generally at the cost of their lives. President Abraham Lincoln was the most notorious assassination victim in early American history. The assassinations of John F. Kennedy, William McKinley, and James Garfield resulted in the deaths of three further American presidents.
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