But a german nation had existed before it was only ripped apart by the nobles ,who wanted their individual territories to be indipendandt. And not to forget dutch isnīt an own language its a german dialect ,which was spoken about 200-300 years ago in the north of germany and there was always a treatie ,which held the territories togethet more or less "Heilige rische Reich deutscher Nationen",so I do think ,there is a fair bit of a general german culture around.