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In page Syrmia County:

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After World War I, the area of Syrmia County became part of the newly formed Kingdom of Serbs, Croats and Slovenes in 1918 and this was confirmed by the Treaty of Saint-Germain in September 1919.[1] The County of Syrmia was an official administrative division of the Kingdom of Serbs, Croats and Slovenes between 1918 and 1922, and then was transformed into the Province (Oblast) of Syrmia (de facto it was carried out in 1924[2]).