A Tripolar Post-Apocalyptic World by Inquisition:
Set approximately four thousand years in the future, a meteor has effectively wiped out the Pacific Rim, and led to a cataclysmic eruption at the Yellowstone volcano that decimated Western/Central North America. Europe has been locked in an ice age for centuries, and many people have fled Earth on vast colony ships.
Now, centuries later, these colonists have returned--but not with altruistic goals in mind.
There are three powers that exert influence on the globe directly, or through proxies: the Greater Anglyskiyan Dominion, the Sagittarian Republic, and the Holy Terran Mandate. The Dominion, in its roots as a joint Russian-Anglosphere exploration mission, dominates the Western Hemisphere throgh its proxy of the Empire of Brazil (currently the most powerful single Earth state) and its allies. It is in the process of pacifying the chaotic, lawless region of the former US East Coast. They tend to only directly take control of certain strategic regions (Panama, the Carribbean islands, the British Isles). In Northern Europe, their puppet states stand in opposition to the Holy Terran Mandate and the Sagittarian Republic. The Republic maintains its hegemony over most of Asia and much of Sub-Saharan Africa with a series of client states, while maintaining direct control of the devastated Australian continent for its rich resources. The Mandate, in its "Christian duty," holds direct control of the Middle East from Turkey to Egypt, as far east as Iraq. They also work through the Holy Ethiopian Empire, their own puppet and the most powerful single state in Africa. They dominate Southern Europe and North Africa as well, keeping the region of Latinum under their direct control.
There are several chaotic zones; the Pacific Rim is generally without government, and Indonesia especially remains a complete wasteland (it was the site of the impact). The American Midwest, northern Mexico, and western Canada are also lawless zones, and the East is a jumbled mess of tiny states slowly being crushed by or subsumed into the Empire of York (the Dominion's puppet state).