Who were primary antagonists in the Balkans region in the early 1900s?

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The primary antagonists in the Balkans in the early 1900s were the Serbs and the Austrians. This was due to the tensions between the Serbian desire to unite all South Slavic peoples under their rule and the fear of Austria-Hungary that this would lead to the collapse of their empire. These tensions eventually led to the assassination of Archduke Franz Ferdinand in Sarajevo in June 1914, which served as a catalyst for the outbreak of World War I.

Who Were Primary Antagonists in the Balkans Region in the Early