Kammala jumla mai zuwa: Bayan ƙarshen Yaƙin Duniya na I Girka ta ɗauki Belgrade a matsayin maƙwabci mai ƙarfi tare da yuwuwar rinjaye a cikin Balkans. Ikon Yugoslav na jawo hankalin tallafi daga manyan ƙasashe, musamman Faransa, ya haifar da damuwa a Athens cewa Yugoslavia za ta matsawa Girka kan matsayin masu magana da harshen Slavic na Girka Macedonia kuma wataƙila har ma da tashar jiragen ruwa na Thessaloniki. Girka ta damu da cewa kusanci na kabilanci, yare da addini tsakanin Yugoslavia da Bulgaria zai haifar da kawance. Wannan kawancen duk da haka bai cika ba kamar yadda Yugoslavia ta kasance jihar da ke da matsayi wanda ke neman ƙarfafa nasarar ƙungiyar haɗin kan Slavic ta Kudu yayin da Bulgaria ta kasance jihar sake dubawa. Kamar yadda lamarin yake tare da Masarautar Serbia a Yaƙin Balkan na Biyu, Yugoslavia ta haɗu tare da Masarautar Girka, Masarautar Romania da Turkiyya wajen kafa Yarjejeniyar Balkan da ke da nufin kiyaye yanayin yanayin siyasa. Idan aka kwatanta da tashin hankali na motsin rai wanda batun Macedonian ya ji daɗi a tsakanin fitattun mutanen Bulgaria, fitattun Serb (kuma zuwa ƙaramin matakin Croat da Slovenian) a cikin Masarautar Yugoslavia sun nuna ƙarancin sha'awar batun. Masarautar Serbia ta sake jujjuya sha'awarta ta fadadawa zuwa kudu (yankuna tare da ƙananan ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilancin ƙabilanci
Rikicin Bosnian da kuma tsoron kewayewa tsakanin Austria-Hungary da Bulgaria masu ƙarfi. A zamanin Yugoslav an san kudancin ƙasar da sunan Vardar Banovina.