Inspired by the "Planet of the Apes" movies, and the thought that domesticated apes, like modernity, were probably not evenly distributed across the planet.
Its been 50 years since WWIII brought an end to the old world. In this universe, as per 1970s expectations, the USSR survived into the 21st century: ironically, it was finally succeeding in reforming economically, after several decades of three steps forward, two back, when the hammer came down. (Rebelling apes in the US seized control of a missile base and some very serious misunderstandings followed.)
The devastation wasnt a full-blown apocalypse, at least for the US and its allies: the technologies derived from a crashed ape-carrying spaceship from an alternate future had helped develop some fairly effective anti-missile tech. Still, the devastation was pretty bad, tens of millions died, central government broke down- and the teeming millions of genetically enhanced ape slaves had their chance.
Not all of the planet was taken over by apes. In much of the third world, local labor was still cheaper than ape labor, especially once you had factored in the cost of raising the apes to adulthood: there werent enough apes to lead a revolt in India, SE Asia, etc. The Soviet Union and its satellites had never gone in for ape slaves, which they considered an insult to the dignity of the proletariat. Much of the Islamic world considered the engineered apes an abomination but the corrupt Saudi potentates were tickled pink by the notion of new-type slaves, which is why the Holy Places of Islam are now under the rule of very hairy
China, which had turned as OTL to a mostly capitalist economy, invested heavily in ape labor to make up for its aging population, and paid the price: only in the south, with the help of the formidable Vietnamese army, did humans win out. South America had a fair number of apes, but not enough to successfully overthrow human rule: in the post-war chaos, like the slaves of old, many fled to the jungles of the interior to create free states of their own.
50 years on, tensions remain high between human and ape. Most of North America, save for the eco-friendly, anarchic (but armed to the teeth) apes of the Pacific Northwest, is under the rule of the Empire (and if you make pregnancy jokes to any of the apes, theyll twist your head off), a military dictatorship in which humans are slaves. Although the human-majority areas of Mexico and Central America are only barely pacified, the aggressive regime has Finlandized the Colombians to force overflights of weapons and supplies to their ape allies in the S. American jungles, conquered the ape homelands of Central Africa, and after coming to help out the apes of Australia in their struggle with the Indians, somehow forgot to leave.
The Pongid Federation of Europe is a much more democratic society (humans dont have the vote and can't bear arms, but arent enslaved - although theyre heartily encouraged to leave), and is making tentative alliances with human powers to prevent further expansion of the Empire, which they find ideologically repulsive apes imitating the worst excesses of human imperialism. They have cooperated with the Brazilians in building puppet states in W. Africa to act as a block to further expansion of the Empire in Africa.
The Caliphate is
weird. The apes have developed their own version of Islam, in which humans have lost the favor of God due to their sins, and apes are the new Chosen People. This doesnt go down well with the Islamic countries, and its only military support from the Empire  that has allowed them to, so far, fight off attacks by the Iranians and the Egyptians. OTOH, they are having a fair amount of luck finding converts in the Empire and the Republic
Brazil is the more-or-less leader of a coalition of S. American countries opposed to any further expansion by the Empire, but they suffer from various economic problems and unstable politics: the Whacky Populist Dictatorship that emerged in the post-WWIII, post-Ape Revolt economic collapse is gone now, but it really didnt help. It looks like Latin America is either going to have to get closer to the Indians, who want to control their economy , or to the Pongid Republic, who are, well, apes. Argentina, meanwhile, is doing fairly well, is comfortably far away from the front lines, and is thinking of establishing a cross-ocean alliance with the S. Africans rather than being dictated to by the poorer and rather chaotic Brazilians.
(South Africa, which weathered the global chaos rather better than most of Africa, expanded mightily at the expense of its northern neighbors, but has run smack into ape-controlled territory, and is looking for allies.)
India is the most powerful human-run state, and dominates the Indian Ocean basin. It has set up puppets in East Africa to block Empire expansion, supported a human revolt in W. Australia, and is working to create a global human alliance under its leadership: they have so far been fairly scornful of Pongid efforts to establish more cordial relations. Hindu/Muslim conflicts have been papered over in union against a common enemy, and some Indians argue that the government needs conflict with the apes to maintain political union. (Such people only occasionally serve prison terms for subversion: after all, any government representative will assure you, India is not a dictatorship!)
Efforts to get the Siberians to sign up in a shiny happy human anti-ape coalition havent gone well: the inhabitants of the radioactive, bombed-out wreck of what was once the USSR arent so sure they are human any more. Living mostly underground, Breeding Prodigiously to make up for a very high death rate, the Siberians are pale, scrawny, and most often physically deformed in some way or other: indeed, there are rumors that the Siberians are in fact deliberately breeding themselves away from the basic human form. But there are a lot of rumors: of strange superweapons and hidden nuclear arsenals, of strange apocalyptic religious rites and burrows extending beneath the borders of neighboring nations. What is actually known is that the rump USSR is a nasty, paranoid, and isolationist dictatorship: that the few representatives foreigners meet are usually funny-looking at best: and that in recent years incursions on Siberian territory by Republic or Chinese Ape forces have generally ended rather badly.
Until recently, there were very few nuclear weapons in the world: those which werent destroyed or used up in the war, were mostly eliminated in the post-war never again reaction. However, as the new ape Empire expanded into chaotic post-war Mexico, as Ape and human clashed again and again in the Middle and Far Easts, and as the Republic began its expansion into the burned and ruined lands of Eastern Europe, a good equalizer began looking increasingly less Unthinkable Evil and more a Necessity. And, of course, before long the Empire had its own developments to protect its people from humans getting the upper hand again, of course. And god only knows what the Siberians, who some think worship The Bomb, are up to. A new arms race appears to be in the offing: nobody really wants it, but can it be avoided?
 And some from the Republic. The Republican government thinks theyre a bunch of crazies, but they dont want to see fellow apes butchered if the Jihad ever succeeds.
 As the Brazilians see it