In 1912, the Balkan powder keg went off as the Ottomans were nearly driven out of Europe. Then a second war broke out against Bulgaria.
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Notes:
The Balkan acquisitions after the Treaty of London were never officially partitioned until the Treaty of Bucharest. I also did not show Bulgaria's positions until the 29th of June because they were jointly occupying some areas with the Greeks during the pre-war clashes on the 26th.
A couple of online maps seemed to claim that Romania took the cities of Pleven and Pazardzhik during the Second Balkan War. However most maps do not show this and no source mentioned such city captures or campaigns. Pleven was the headquarters of one of Bulgaria's army groups so it seemed hard to believe this supposed event happened without any professional source mentioning it, so I didn't include it.

Sources:
Balkan Harbi Kronolojisi. of Genelkurmay Askerî Tarih ve Stratejik Etüt Başkanlığı Yayınları. Ankara: Genelkurmay Basım Evi, 1999.
Basil, Papas N. “The Unseen Athonites and the Battle for Macedonia.” Pemptousia, November 23, 2015. https://pemptousia.com/2015/11/the-un....
Fatos. “Lufta 9 Vjeçare E Dibrës Më 1912-1921, Si U Organizua Kryengritja e Përgjithshme, Masakrat, Gjenocidi Serb Dhe Shpërngulja.” Sot News, September 24, 2013. https://sot.com.al/dossier/lufta-9-vj....
Hall, Richard C.. The Balkan Wars 1912-1913: Prelude to the First World War. United Kingdom: Taylor & Francis, 2002.
Pohoaţă, Nicu. “Romania and the Entente During the Conference in Sankt Petersburg (March – May 1913).” Cogito 4, no. 2 (2012): 39–52.
Temizer, Abidin. “Montenegro in the First Balkan War.” Annals of the Academy of Romanian Scientists, History and Archeology, 5, no. 1 (2013): 65–80.
"Treaty of Athens." Signed on 14 November 1913.
"Treaty of Bucharest." Signed on 10 August 1913.
"Treaty of Constantinople." Signed on 29 September 1913.
"Treaty of London." Signed on 30 May 1913.

Music:
"Five Armies" and "Devastation and Revenge" by Kevin MacLeod
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