Final answer:
Serbia directly supported the assassination of Archduke Ferdinand in 1914, triggering a chain of events that led to World War I.
Explanation:
The country that directly supported the assassination of Archduke Ferdinand in 1914 was Serbia. The assassination set off a series of events leading to World War I. Serbia was backed by Russia, France, and Great Britain, while Germany, Austria-Hungary, and the Ottoman Empire supported Austria-Hungary in response.
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