Well are you going to be able to play nations that form during the game? or will you have to start a game and switch countries once the country forms, like the Netherland in EU2.
It would be cool for us Canadians if you could start as Upper Canda and eventually switch to Canada.
Canada might seems boring, not too many wars other than the Boar war and WW1, but it would be interesting building the railway and the nation in general. Well it would be interesting for us anyway...
I think Japan would be cool to play too. You'd start rather backwards but towards the end of the game you could warmonger agaisnt China and Russia, and maybe have a go at grabbing some other colonies from England, France, or the Netherlands.