I have just found a cheat also from the RON forums
Basically it's the switch nation cheat How it works is, first just say I am Australia, and I want to switch to USA, go over to were the USA is located on the map click on them on the map select them like press on there map (I hope I aint being as confusing as I sound, but I am dyslexic)Type in the code above as you would any other cheat. and that will switch you to the USA. I hope this helps.
O and yes once ya do this you can send aid and all the other stuff that ya could do in the old switch nation cheat.