Upper Silesia different from Upper Silesia Province
Plebiscite and partition
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.
From 1919-1921 three Silesian Uprisings occurred among the Polish-speaking populace of Upper Silesia; the Battle of Annaberg was fought in the region in 1921. In the Upper Silesia plebiscite of March 1921, a majority of 59.4% voted against merging with Poland and a minority of 40.6% voted for, with clear lines dividing Polish and German communities. The plan to divide the region was suggested by the Inter-Allied Commission on Upper Silesia, headed by the French general Henri Le Rond. The plan was decided by an ambassadors conference in Paris on 20 October 1921. The exact border, the maintenance of cross-border railway traffic and other necessary co-operations, as well as equal rights for all inhabitants in both parts of Upper Silesia, were all fixed by the German-Polish Accord on East Silesia, signed in Geneva on 15 May 1922. On 20 June 1922 the Weimar Republic ceded the East Upper Silesia region to Poland.  The area became part of Silesian Voivodeship of the Second Polish Republic.
not same as not identical to distinct from separate from unlike