The communist German Democratic Republic was established in the historic "Mitteldeutschland" ( Middle Germany ). Former German territories east of the Oder and Neisse rivers, mainly the Prussian provinces of Pomerania , East Prussia , West Prussia , Upper Silesia , Lower Silesia , the eastern Neumark of Brandenburg , and a small piece of Saxony were thus detached from Germany. To compensate Poland for the USSR's annexation of its eastern provinces, the Allies provisionally established Poland's post-war western border at the Oder–Neisse line at the Yalta Conference (1945). As a result, most of Germany's central territories became the Sowjetische Besatzungszone (SBZ, Soviet Occupation Zone). All other lands east of the Oder–Neisse line were put under Polish administration, with the exception of historic northern East Prussia , which went to the USSR. 
American German shepherds represent most of the international show lines of German shepherds and have a very sloped back and sharp angle in their hindquarters. The American lines tend to be longer and leaner than both types of German lines. British German shepherds have large bones and a long, straight body. Both British and American lines have calmer temperaments and lower energy requirements than the German lines. The Czech German shepherd lines have many similarities to the east German lines, and some consider them the same type of German shepherd. Other less known German shepherd lines are the white German shepherds (not albino) and long-haired German shepherds.