World War I | History, Summary, Causes, Combatants ... - Britannica
https://www.britannica.com/event/World-War-I
Web3 days ago · World War I, international conflict that in 1914–18 embroiled most of the nations of Europe along with Russia, the U.S., the Middle East, and other regions. It led to the fall of four great imperial dynasties and, in its destabilization of European society, laid the groundwork for World War II.
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