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I'm asking this for a TL, i haven't done much research into it yet; But if through some way the German confederation federalizes with Austria (I read somewhere and even saw a map of what the new country would look like.) Leaving hungary and czecho-slovakia as crown lands.
If this German empire would enter into a personal union with the kingdom of the Netherlands (including belgium and luxemboro) and eventually that federalizes (in the same way as the OTL german empire) into a Germainic Union.
Now given this new Greater germany, how would (if it even happened) WWI go. I'm assuming since Belgium is a part of the Netherlands England has no reason for declaring war aside from fear of losing its status.