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In OTL Bulgaria joined the axis mainly because mister Adolf needed to pass by to help italy in Greece( war started in October), he could go through Yugoslavian macedonia but the terrain was mainly mountains so it would be very hard to do so. Otherwise Boris 3 politics was to keep neutrality and try to retake it's territories lost in WW1 (https://en.wikipedia.org/wiki/Treaty_of_Neuilly-sur-Seine) with diplomacy, his father ( Ferdinand I) already helped to regain dobruja in the Craiova Treaty( 7 September).
pod: Benito listens to Hitler and doesn't act like a envious child so he just avoids engaging Greece, neither sinks their battleship in august 1940. Greece minds it's own business while Yugoslavia has the same events as OTL. Knowing that both Bulgaria and Greece would stay neutral( 1 is slightly pro-axis the other one is semi-fascist with Metaxas). Could Bulgaria Remain neutral in the war and still hope to regain some territories( side quest) and most importantly avoid the soviet period?
pod 2: Same events as OTL and Bulgaria joins axis but is not forced to declare war on anyone(13 dec 1941 Hitler forced token war declaration on USA and Brits) do they join allies as soon is clear Hitler will loose or nothing changes? does this prevent 50 years of commies?