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The Province of Lower Silesia (German: Provinz Niederschlesien) was a province of the Free State of Prussia from 1919 to 1945. Between 1938 and 1941 it was reunited with Upper Silesia as the Silesia Province. The capital of Lower Silesia was Breslau (now Wrocław in Poland). The province was further divided into two administrative regions (Regierungsbezirke), Breslau and Liegnitz.
The province was not congruent with the historical region of Lower Silesia, which now lies mainly in Poland. It additionally comprised the Upper Lusatian districts of Görlitz, Rothenburg and Hoyerswerda in the west, that until 1815 had belonged to the Kingdom of Saxony, as well as the former County of Kladsko in the southeast.
The province was disestablished at the end of World War II and with the implementation of the Oder-Neisse line in 1945, the area east of the Neisse river fell to the Republic of Poland. The smaller western part was incorporated into the German states of Saxony and Brandenburg.