After World War I the Czechoslovak state laid claims to the region of Kladsko , particularly because of the Czech Corner where Czech language and culture were still prevalent . These territorial demands were flatly rejected however by the 1919 Treaty of Versailles . With the implementation of the Oder-Neisse line at the Potsdam Conference in 1945 , most of the territory of Prussian Silesia &ndash; including Kladsko &ndash; became part of the Republic of Poland . Its native German and Czech population was expelled . According to canon law however , the area was part of the Roman Catholic Archdiocese of Prague until 1972
Potsdam Conference
Potsdam Conference
County of Kladsko