Our Timeline:
- 1912-1913: Bulgaria, Serbia, Greece, and Montenegro fight the first Balkan War against Turkey.
- 1913: Bulgaria fights the Second Balkan War against Turkey, Serbia, Greece, Montenegro, and Romania.
- 1915: Bulgaria enters WWI as a Central Power
- 1918: Bulgaria surrenders to Allies after French, British, and Greek armies invade.
- 1919: Treaty of Neuilly limits Bulgaria's borders and their army.
- 1934: Bulgaria abstains from the Balkan Pact.
- 1938: Bulgaria resets relations with Greece and Yugoslavia, and signs nonaggression pact with Turkey. Around this time Bulgaria abrogates the Treaty of Neuilly.
- 1940: Bulgaria receives Dobruja back from Romania.
Possible Timeline #1:
- 1912-1913: First Balkan War, as historical.
- 1913: Second Balkan War, as historical.
- 1915: Bulgaria joins Central Powers.
- 1916: Atlantis, France, Britain and Greece defeat Ottomans and invade southern Bulgaria. Bulgaria surrenders.
- 1919: Treaty of Neuilly (as historical).
- 1920s: Allies drop the Treaty of Neuilly for some reason.
Possible Timeline #2:
- 1912-1913: First Balkan War, as historical.
- 1913: Larger Bulgarian losses in Second Balkan War; Alternate Treaty of Neuilly signed.
- 1915: Pressure by Allies+neutral Greece convinces Bulgaria to remain neutral.
- 1919: Internal political pressure results in Tsar Ferdinand's abdication
- 1925: Greece, Yugoslavia, and Romania terminate Alternate Treaty of Neuilly.
My biggest difficulty in all of these timelines is that Bulgaria bought the Philippine predreadnought Angeles in 1926. That's a massive aberration from the Treaty of Neuilly, and when the previous Bulgarian player inquired about it, the decision came down that Neuilly was ended before the battleship was purchased in 1926.
If Bulgaria participated in WWI, then they made off like a bandit to get Neuilly dropped like a hot potato. If Bulgaria did not participate in WWI, then they had a worse Second Balkan War.