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On this day, Archduke Ferdinand and his wife in Austria-Hungary were assassinated by a Serbian.
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On this day, Austria-Hungary declared war on Serbia one month after the assassination.
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On this day, Germany declared war on Russia.
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On this day, Germany declared war on France.
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On this day, Britain declared war on Germany.
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On this day, Austria-Hungary declared war on Russia.
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On this day, France and Britain declared war on Austria-Hungary.
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On this day, the U.S. joined the war supporting their allies, Russia, Britain, and France.
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The Allies and Germany signed an armistice on this day, causing the end of the war.
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The war officially ended after the Treaty of Versailles was signed on this day.