Yugoslavia - New World Encyclopedia
https://www.newworldencyclopedia.org/entry/Yugoslavia
WebThe Kingdom of Yugoslavia ( December 1, 1918,–April 17, 1941), also known as the First Yugoslavia, was a monarchy formed as the "Kingdom of Serbs, Croats and Slovenes" after World War I and re-named on January 6, 1929, by Alexander I of Yugoslavia. It was invaded on April 6, 1941, by the Axis powers and capitulated 11 days later.
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