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The split of the conservative so-called "union parties" in Germany effectively dates back to the Weimar National Assembly when Bavarian Center Party deputies broke off from the Center Party and founded the Bavarian People's Party as a countermove to Matthias Erzberger's idea of unitarism for Germany.
After World War II, center-right parties changed a lot. But the old divide between Center and BVP continued with the divide of CDU and CSU, their super-confessional daughter parties who managed to slick most former voter bases of e.g. DVP and DNVP, being major consolidators of post-war democracy. And as anybody in Germany know, CSU fiercely demands to have her autonomy continuously respected. CSU joining the CDU would by many considered as an act near heresy.
So what would it take, preferably with a POD after World War II, to make the CSU join the CDU just as an ordinary state division?