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| | Prussia. The Columbia Encyclopedia, Sixth Edition. 2001-05 |
 | | Before 1919 it consisted of 13 provinces: Berlin, Brandenburg, East Prussia (separated after 1919 from the rest of Prussia by the Polish Corridor), Hanover, Hesse-Nassau (see Hesse), Hohenzollern (a Prussian enclave between Württemberg and Baden in SW Germany), Pomerania, Rhine Province, Saxony, Schleswig-Holstein, Upper Silesia and Lower Silesia, and Westphalia. |
 | | In 1618 the duchy of Prussia passed through inheritance to the elector of Brandenburg, and in 1660, by the treaty of Oliva, full independence from Polish suzerainty was confirmed to Frederick William, the Great Elector. |
 | | the electors of Brandenburg directed themselves westward, acquiring the duchy of Cleves, together with the counties of Mark and Ravensberg (1614) and the bishoprics of Minden, Magdeburg, and Halberstadt (1648). |
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