Gukan can you make RSK on the map to see how it look like.
I can't now, to much work for no win. I was able to do it before only because i keep track on every province to know exactly where they belong.
The RSK is now integrated inside Croatia... but you can do it yourself. If you launch the game you can open the console (F12) and write show_id (or showId i don't remember exactly, try diferent convinations). Every time you pass your mause over a province you will see the province id of the province. You can write down every province you feel than belongs to RSK.
Then go to the scenario/YUG folder copy the files ENG.inc and give it the name USA.inc.
Open it and replace every ENG you find by USA.
Delete what is behind 'nationalprovinces = { ' except the closing '}' and add betwen {} the provinces number you capied before.
Repeat the same for ownedprovinces and controlledprovinces
Open the FRA.inc and delete from nationalprovinces, ownedprovinces and controlledprovinces the provinces you added in the USA.inc file.
Finally go to the folder /scenarios open the file YUG.eug and add USA behind the selectable countries.
Add the line USA = { } under CAN = { }
And add include = "scenarios\YUG\USA.inc" under include = "scenarios\YUG\SOV.inc"
That will make it and you will be able to play as RSK (selecting USA of course)