Answer: The First World War started in August 1914. It would last for more than four years, and kill about nine million people in uniform. Who won World War I? The Allies won World War I after four years of combat and the deaths of some 8.5 million soldiers as a result of battle wounds or disease. Read more about the Treaty of Versailles. In many ways, the peace treaty that ended World War I set the stage for World War II.
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