George Orwell's classic 1984 presented a world constantly at war with three super-powers of Oceania, East Asia, and whatever the Russia/Europe one was. Africa was the main battleground. I don't know if this is something anyone would be interested in doing or if it's feasible. Not sure how you'd do the bonuses, but it could be a smaller map with 4 main bonus regions (each superpower and Africa) or you could divide it further...
Just throwing it out there.