Funny idea, but why go with ugly post 1918/45 borders?The Triumph of Dualism
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Netherland? /not sure if on "equal therms", but theres probably better chance to it, than with Austria)With Austria taken, who could you unite Germany with in somewhat equal terms?
Or, if we are going more on equality, then probably Franco-German union/confederation?
Italy and Spain, which @DracoLazarus suggest unite with France, could be then united together...