State of Hanover
The eastern areas of Brunswick which had fallen to the Soviet zone, including the old County of Blankenburg and the exclave of Calvörde (part of the Helmstedt district) were not part of Lower Saxony and later made part of the East German state of Saxony-Anhalt. The former Hanoverian Soviet-occupied lands of Amt Neuhaus and the eastern parts of Bleckede were again made part of Lower Saxony after German reunification in 1990.