alternatehistory.com

In OTL the last main thing that Karl I of austria hungary did on his political life was try to take over the Hungarian throne:

"Encouraged by Hungarian royalists ("legitimists"), Charles sought twice in 1921 to reclaim the throne of Hungary, but failed largely because Hungary's regent, Admiral Miklós Horthy (the last commander of the Imperial and Royal Navy), refused to support him. Horthy's failure to support Charles' restoration attempts is often described as "treasonous" by royalists."

According to the same text, Horthy was a monarchist but he was fearfull because the neighbour countries were menacing to invade if he tried to restore the Habsburg empire. The PoD is that Horthy does accept to allow Karl I to be crowned the emperor of Hungary, and as a assurance to the neighbours Karl I makes a public statement to follow the treaty of Trianon (if he keeps following it twenty years later is a completely different thing). What can we expect? Can as time passes the Austrians get closer to habsburg Hungary than to Germany? Could this somehow prevent Hitler raising in Germany?
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