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I was wondering what it would take that the Slavonic peoples dwelling in today's Eastern Germany, between Elbe and Oder as late as in the 12th century, could establish one or several sovereign states which survive for long; preferrably more sovereign than Bohemia, that is.
My impression is that they were lacking only two items:
Christianity: Few of their leaders and hardly any men in the streets converted to Christian religion. This provided the German princes with an excellent pretext for conquest.
Unity: The different tribes did not manage to unite and establish an actual state. And when they did so, it was too late and to restricted in extent (Wangria).
Therefore I figure it is not too improbable. Or did I miss an important aspect ?