https://en.wikipedia.org/wiki/Free_State_of_Prussia 9 November 1918
https://en.wikipedia.org/wiki/Krupp#The_Franco-Prussian_War
https://en.wikipedia.org/wiki/Krupp#Alfried.27s_era
https://en.wikipedia.org/wiki/German_Empire#Linguistic_maps
https://en.wikipedia.org/wiki/German_Empire#Industry
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