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Post 1880, the duchy of Schleswing-Holstein was apart of the German Empire and remained up until 1920, where it was reincorperated into Denmark proper.
Simple question:
What if Hitler, after Munich but before Danzig demanded the return of Northern Schleswig territory, similar to the Danzig ultimatum.
How would the allies responded? If they did a "Polish Guarentee" of Denmark, could Hitler then be free to attack Poland over Danzig instead?