Brandenburg (De-Brandenburg; Lower Sorbian: Bramborska; Upper Sorbian: Braniborska) is one of the sixteen states of Germany. It lies in the east of the country and is one of the new federal states that were re-created in 1990 upon the reunification of the former West Germany and East Germany. The capital is Potsdam. Brandenburg surrounds but does not include the national capital Berlin. Historically, Brandenburg was an independent state, the Margraviate of Brandenburg, which grew to become the core of independent Prussia and later the German state of Prussia. About a third of historic Brandenburg (land east of the Oder River) was annexed by Poland following the establishment of the new Oder-Neisse border in 1945 by the Allies. This region was historically known as East Brandenburg. The federal state of Brandenburg is named after the town of Brandenburg an der Havel.