I could call may-self Prussian, having almost the same title as they do.:)
Sure why not?
Prussia was very multi-kulti for it's time...Germans from everywhere, french huguenots, Jews, Poles ...
It's a state of mind rather than an everchanging geographical event. "Prussian virtues" are still very much en vogue in Germany. It had been these virtues which made people able to stamp one of the most important empires out of the barren brandenburgian sand.
It had been these virtues which enabled the Germans to pull themselves out of the dirt again and again through hard work.
And not to forget the shifting of the center of the new, re-unified Germany from cozy, comfy, dull Bonn (Bonn republic) to Berlin (Berlin republic) changed the old rhenish Bundesrepublic to a much more prussian Germany in attitude and outlook. These changes are already felt in Europe! ;)
A source of current conflict with other countries in Europe who don't follow similiar virtues, like austerity, especially now in a time of crisis.
It's a matter of spirit and that lives on! :)