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What if Leopold, Prince of Hohenzollern accepted the crown of Spain? Perhaps Bismarck foresaw that war with France was inevitable (and didn't he kind of want it?) and suggests that Leopold and Wilhelm call Napoleon's bluff. Prussia already won a great victory against the French, and maybe with an allied Spain, they could possibly take more from the French, and with a victory in its first war with its new leader, maybe Spain can get back on its feet under a Hohenzollern ruler, gaining him popularity and the support of the people?
My apologies if this has been asked before, but I'm really intrigued by this as the Hohenzollerns seem to be pulled a Habsburg peace-though-marriage strategy with their blood under the crowns of Romania, Yugoslavia (to a point) and now even Spain.