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After WWI the monarchy in Hungary wasn't abolished until 1921, in fact the choice was made to keep the monarchy. Karl was not installed as King Karl IV of Hungary however because Miklos Horthy, Hungary's regent, resisted any such attempt. Suppose he allowed Karl to become King of Hungary, even if it's just as a constitutional monarch.

How does this change history? Would the Habsburgs enter the war or remain neutral if they had a say in the matter? IIRC Otto was an Austrian nationalist and opposed the Nazis and the Anschluss in 1938. And if by any chance Habsburg Hungary successfully remains neutral, will Stalin leave them alone or invade them?

And does this highten the chance of reinstating the Habsburgs in Austria, perhaps binding them in personal union but otherwise letting both countries keep their own respective governments?
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