After World War I and fall of Austria-Hungary the region of Cieszyn Silesia including the territory of Bielitz political district became disputed land between Czechoslovakia and Poland. Local Germans also had a different aspirations. This led to Polish–Czechoslovak War and the division of the region and district on 28 July 1920, by a decision of the Spa Conference. The district of Bielitz/Bielsko as a whole became a part of Poland and was transformed into Bielsko County, without excluded part of municipalities of the former Skotschau/Skoczów legal district that were transferred to Cieszyn County.