The Silesian Uprisings (Polish: Powstania śląskie) were a series of three armed uprisings (1919–1921) of the Polish people in the Upper Silesia region against Weimar Republic in order to join the region (where in some parts Poles constituted a majority) from Germany and join it with the new Polish state, which had been established following World War I (1914–1918). The Treaty of Versailles had ordered a plebiscite in Upper Silesia to determine whether the territory should be a part of Germany or Poland. The plebiscite took place as arranged on March 20, two days after the signing of the Treaty of Riga, on March 18, 1921, which ended the Polish-Soviet war of 1919–1920. In the plebiscite, around 707,605 votes were cast for Germany, while 479,359 for Poland. The Germans thus had 228,246 votes of majority.