I’m basing the list on the assumption that the map tts will not change; if they do then there are more changes I’d make.
Bulgaria @ 4 is plausible for military consideration, but is it worth that economically? Same with Serbia - a toughened army that gave the Austrians a hard time, but the country was not developed economically.
Maybe Bulgaria, Turkey, Serbia, Romania & Greece get a “Balkan Bonus” to starting units to reflect recent combat experience (as opposed to a lack of it in A-H).
I also think there should be more starting fighters; Italy used aircraft in the Libyan war, and Bulgaria flew planes over Constantinople during the Balkan wars; so I think Italy, the UK, Turkey and Austria should get a starting fighter; maybe Bulgaria too and France & Germany 2 each.
http://en.wikipedia.org/wiki/Bulgarian_Air_Force#First_and_Second_Balkan_Wars
http://en.wikipedia.org/wiki/Serbian_air_force#History
http://en.wikipedia.org/wiki/Greek_Air_Force#History
http://en.wikipedia.org/wiki/Austro-Hungarian_Imperial_and_Royal_Aviation_Troopshttp://en.wikipedia.org/wiki/Romanian_Airforce#History
http://en.wikipedia.org/wiki/Ottoman_Air_Force
Incidentally Persia seems to have had no railways, so it should be added to Africa & Afghanistan as areas where rail (i.e. 2-space) movement is not permitted.
Its another anomaly in that it had rich resourses (oil) but scarcely an army worth the name.
Regarding Argentina (above) it was more a case of it being anti-Brazil in terms of a naval arms race; so maybe if Brazil is activated by the USA then Argentina can be brought in by the CPs.