I think that I agree with Steve, here, Phil. Afterall, you have Japan (Mishiman), Eurasia (Bauhaus), North America (Capitol), and the British Isles and Australia(Imperial).
It seems that the Ubuntu conept would work great. I think that Africa could have both a Megacorporation, as well as a tribe or two. Afterall, Africa has many cultures, today, including Native Africans, North Africans-Middle Easterners, Europeans, etc.
South America has several cultures, including Native Americans (Incans, Mayans, etc.), Portuguese and other Europeans (Falklands being Imperial, by game standards).
Another Megacorporation could arise, much like Cybertronic did.
I think that India falls withiin the tribes (Cresentians), or part of Imperial (a new colonialism?) but could, easily, be considered for a new Megacorporation.