[Answer] What country's declaration of war triggered the start of World War I?

Step 1 : Introduction to the question "What country's declaration of war triggered the start of World War I?"

...After Bosnian Serb Gavrilo Princip assassinated Archduke Franz Ferdinand, Austria-Hungary declared war on Serbia in July 1914. Its ally, Germany, then declared war on Russia. The rest is World War I history.

Step 2 : Answer to the question "What country's declaration of war triggered the start of World War I?"

Austria-Hungary:

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