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The Sopron area plebiscite took place on 14–16 December 1921. In the plebiscite, the residents of an area of 257 km2, comprising Sopron and eight surrounding settlements, voted on whether to remain in Hungary or to join Austria. After World War I, that was the only plebiscite concerning disputed borders on territory of the former Kingdom of Hungary that was permitted by the Entente.[1][2]