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Could all Germanic speaking peoples from Hannover to Vienna ever unite into the fabled Grossdeutchland or Greater Germany? I personally don't think so, Prussia was not to fond of the idea and was key in ending the idea during 1848. Bismarck then ended any immediate possibility of it happening with the defeat of Austria in the Austro-Prussian War in 1866. Germany tried during World War II again and look how that ended.