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So in the original draughts of what to do with Germany post-WW2 a far more logical division was favoured- that of N.Germany/S.Germany.
Of course there were a lot of other weird parts to the plan intended to cripple Germany but we can assume those would go away as time moved on.
So, WI the borders were arranged like this?
For the international zone we can assume it would eventually attain full autonomy as a third nation.
To get rid of the potential trouble of a communist North Germany (a bit asb considering how far west it goes) assume that all these nations are like Austria- capitalist but neutral.