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This single event helped to spark WWI (give specific details - who, what, when, where, and why):
Who is Serbian nationalist Gavrilo Princip assassinated Archduke Francis Ferdinand and his wife, Sophie (natives of Austria-Hungary) while visiting Sarejevo, the capital city of Bosnia, on June 28, 1914, out of revenge because he believed that Austria-Hungary had no right to take over and rule Bosnia, a former territory of Serbia?