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What was the event that started World War I?
The assassination of Archduke Franz Ferdinand of Austria-Hungary
What year did World War I begin?
1914
Which country switched sides during World War I, joining the Allies in 1915?
Italy
What was the name of the treaty that officially ended World War I?
The Treaty of Versailles
Which countries were the primary winners of World War I?
United Kingdom, France, United States
