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World War I began in 1914, after the assassination of Archduke Franz Ferdinand, and lasted until 1918.(4 years, 3 months and 2 weeks)

Location:

1. Europe
2. Africa
3. The Middle East
4. The Pacific Islands
5. China
6. Indian Ocean
7. South America
8. North America

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Result

Allied Powers victory
Central Powers' victory on the Eastern Front nullified by defeat on the Western Front
Russian Civil War and foundation of the Soviet Union
Establishment of the League of Nations
Fall of all of the continental European empires

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