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In page Burgenland:

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With the help of Italian diplomatic mediation in the Venice Protocol, the crisis was resolved in the autumn of 1921, when Hungary committed to disarm the sharpshooters by 6 November 1921. This was in exchange for a plebiscite on the unification of certain territories, including Ödenburg (Sopron), the designated capital of Burgenland, and eight surrounding villages. The vote took place from 14 to 16 December, and resulted in a clear (but doubted by Austria)[citation needed] vote of the people who inhabited the Sopron district to be part of Hungary. Consequently, the territory was incorporated into Austria, except for the Sopron district which was united with Hungary.[1][2][3]