The murder of what man set off a chain reaction
leading to WWI?

Austria Arch Duke Fraz Ferdinand

explanation

The assassination of Archduke Franz Ferdinand of Austria, heir presumptive to the Austro-Hungarian throne, and his wife, Sophie, Duchess of Hohenberg, occurred on 28 June 1914 in Sarajevo when they were mortally wounded by Gavrilo Princip.

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answer; obscene;