Why the German Confederation excluded Hungary and Eastern Prussia...

...while included realms which depended on foreign non-German powers like Denmark (Holstein), UK (Hannover) and the Netherlands (Luxemburg and Limburg)?

I have read in many sources that the reason for excluding Hungary and Eastern Prussia was that 'they did never belong to the HRE', but it seems a quite stupid reason IMO.
In the case of Hungary it could be argued that they were not mostly populated by Germans, but Bohemia and Carniola were already included; Eastern Prussia was mostly German by then.
Following the HRE criteria Belgium should have been included too.
 

Anderman

Donor
The German Confederation was set up during the Congress of Vienna as the successor for the HRE so only areas that were part of the HRE could be part of the GC.
Belgium didn´t exist at this time it was part of the Kingdom of the Netherlands and that state left the HRE after the war of 30 years.
Prussia never was part of the HRE which was quite handy for the grand elector of Brandenburg to crown him self King in Prussia so that the Emperor of the HRE didn´t want a word with him.
And so on and so it made sense for the powerful of this time.
 
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