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The Harz is the highest mountain range in northern Germany
and a rugged terrain extends across parts of Lower Saxony, Saxony-Anhalt and Thuringia.
for more info: http://en.wikipedia.org/wiki/Harz
how are the chances this can become a Kingdom ?
in normal course of County -> Margrave -> Duchy -> Kingdom
some problems
the black plague and later Thirty Years' War who depopulated the regio around 65%!
(or is this a opportunity by repopulate the regio ?)
also Prussia expansion in Seven Years' War and Napoleonic Wars
is here a chance the Harz can become a Kingdom during Congress of Vienna in 1815 ?
and finaly the integration in German Empire in 1870