When Serbian nationalist Gavrilo Princip fatally shot the heir to the Austro-Hungarian throne, archduke Franz Ferdinand, in Sarajevo on 28 June 1914, the assassination is seen as the event that ushered in the First World War. Within a month, the Great Powers of Europe would becomeembroiled in a four-year war owing to a web of alliances and treaties: Russia, France, Britain on the one hand; Germany, Italy, and the Austro-Hungarian and Ottoman Empires on the other. The US would eventually enter the maelstrom in April 1917 on the side of Britain and the Entente allies against the Central Powers.


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