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In the 1860s, it was a race between Prussia and Austria to unify Germany, a race which the Prussians wound up winning. And I think that the Austrians got lucky because of that, even if they didn't know at the time. It seems like this would further worsen ethnic tensions, and that the Germans who are now forced into a union with Hungarians, Czechs, Slovaks etc. would long for Prussian rule.