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Bosnian Serb named Gavrilo Princip assassinated Archduke Franz Ferdinand, heir to the Austro-Hungarian throne.
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Austria-Hungary declared war on 28 th July.
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Russia came to Serbia's defence, and by 4 th August, Germany, France, and Britain were drawn into the war.
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Bulgaria, Italy, Romania, Greece and others joined in from 1915 onward.
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The United States entered the war.
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The dissolution of the Russian, German, Austro-Hungarian, and Ottoman Empires resulted in the creation of new independent states, including Poland, Finland, Czechoslovakia, and Yugoslavia.
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The end of the war.