Uprising in West Hungary

According to the Treaty of Trianon, the city of Sopron in western Hungary and its surroundings were assigned to Austria. After an uprising in 1921 in this region, a referendum was held and 65.8% of the votes were in favor of belonging to Hungary. This referendum was accepted by the major powers and the transition of Sopron from Austria to Hungary was the only serious territorial revision in the years following the Treaty of Trianon.