Individual #Prussia__Preussen  a former kingdom in north-central Europe including present-day northern Germany and northern Poland; "in the 19th century Prussia led the economic and political unification of the German states"
  instance of:  geographical_area
  member:  Prussian
  part of:  Germany  Poland
  part:  Brandenburg  the territory of an Elector of the Holy Roman Empire that expanded to become the kingdom of Prussia in 1701

No statement uses or specializes Prussia; click here to add one.