Latest POD to Avoid German Unification?

Anaxagoras

Banned
What is the latest plausible POD that prevents Germany from becoming unified and keeps it in its traditional state of separate small kingdoms, dukedoms, ect.?
 
Have Nappy III help Austria out during the Austro-Prussian War or at the very least make the French army realize their inadequacies ten to twenty years before the Franco-Prussian War and reform before then.
 
What is the latest plausible POD that prevents Germany from becoming unified and keeps it in its traditional state of separate small kingdoms, dukedoms, ect.?

Prussian defeat in the Austro-Prussian War, which is what led to Prussia conquering other small German states.
 
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