Hlučín Region
In 1919, after World War I, the eastern part of Prussian Upper Silesia (with a majority of ethnic Poles) came under Polish rule as the Silesian Voivodeship, while the mostly German-speaking western part remained part of the Weimar Republic as the newly established Upper Silesia Province. In early 1919, the Polish–Czechoslovak War broke out around Cieszyn Silesia, whereafter Czechoslovakia gained the Zaolzie strip in addition to the Hlučín Region.