World War I was fought between the Allied Powers (including France, Great Britain, Russia, Japan, Italy, and the United States) and the Central Powers (including Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria).
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It lasted from 1914 to 1918 and led to about 18 million deaths. It also had a huge impact on the structure of modern-day Europe.
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Why would so many countries go to war with each other?
Check out some of the most important reasons behind World War I.
