AH Challange: Keep the HRE alive

I want someone to come up with a plausible scenario for keeping the Holy Roman Empire Alive until at least the Begining of the 20th Century. How it falls after that I don't care much(I'm leaning toward a collapse brought on by ww1). Though there were Holy Roman Emperors after the Reformation and Luther, the HR Emporer had little to no power.
So keep it alive until the 20th Century, just make sure it is plausible.
Have Fun.
 
We'll the HRE survived until the 1800's (basically as a title, but nonetheless). Maybe Prussia and Bismarck keep the title around in an effort to stir up German nationalism under the Prussian throne. Maybe you can get it so that the Prussian emperors also get the title of Holy Roman Emperor somewhere in their title. That would at lest keep the HRE around to an extent until 1918.
 
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