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If the war, albeit as a Prussian victory, ended early, is there any way it could have been *too early* and left the formal creation of the 2nd Reich undone.

How many weeks of war were needed to bind the German states together sufficiently to get OTL's outcome of Prussian King as German Emperor?

Looking at things from the other end, is it possible that the war could have resulted in creation of the Second Reich under the Hohenzollerns *even if* the war was a modest French victory or stalemate rather than Prussian victory?
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