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The Austro-Slovene conflict in Carinthia was a military engagement that ensued in the aftermath of the World War I between forces loyal to the State of Slovenes, Croats and Serbs and later the Kingdom of Serbs, Croats and Slovenes, and forces loyal to the Republic of German-Austria. The main theater of the conflict was the linguistically mixed region in southeastern Carinthia. The conflict was settled by the Treaty of Saint-Germain in 1919, which stipulated that the territorial dispute be resolved by a plebiscite.