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When did World War I begin?
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World War I began on July 28, 1914, when Austria-Hungary declared war on Serbia following the assassination of Archduke Franz Ferdinand. This initial conflict rapidly drew in major powers due to a complex web of alliances, leading to a global struggle that involved many nations and lasted until November 11, 1918. The war fundamentally reshaped international relations and had lasting impacts on the 20th century.