Post-war Zaire was, suffice to say, not exactly
stable given its unusual origins. While the Germans foisted off the administration structure of the former Reichskommissariat Mittelafrika onto the various native tribal leaders, giving
some semblance of a functional government, that didn't mean all of its problems just went away: on the contrary, the young country's government was inexperienced, extremely fractured along tribal divides, and out of its depth in governing such a large amount of territory; its leadership was composed of elders and chieftains who previously only led their local communities, alongside Western-educated African intellectuals who nonetheless only had theory to work off of. Combined with the unpleasantness of over a century of colonial occupations (most infamously being the Belgian Congo under King Leopold II), and you have a fragile country that could collapse into violent anarchy and inter-ethnic conflicts at any moment. Needless to say, the British had their hands full holding the region together and preparing it to stand on its own as an independent nation.
The British had no intentions of keeping the entire region for themselves, as their colonial empire was already stretched thin as it is, and with the war having been ruinously expensive to Britain, adding another colony to its collection was just not worth the expense in maintaining alongside its other commitments; and they
certainly weren't going to return these territories to Belgium and France - especially not the latter, given how hard of a time they were having trying stubbornly hold on to what they have left already. Thus, decolonization was the only viable option.
Of course, decolonization meant more than just handing off sovereignty to the local populace: it also meant making their new nation economically viable and politically stable, so it won't just fly apart into an orgy of violence the moment the British leave. So for the British, that meant a few more years of occupation that the local populace would have to put up with... and said populace, full of diversity in unique cultures and ethnic groups, was running increasingly short on patience with their colonial overlords. If the British wanted to avoid complete catastrophe, they would have to work
fast to build up the necessary capital to invest in industrializing Zaire.
Enter
Ayn Rand. After suffering from a depressive funk due to dismal sales of her book
Atlas Shrugged in 1957, notorious author Ayn Rand threw herself into developing her newly-founded 'philosophy' of Objectivism; a chance encounter with one Ron Hubbard (hack sci-fi author and founder of Scientology) led her to decide making
Atlas Shrugged a reality - by setting up her own country in the Autonomous Region of Katanga. Convincing a number of economists and corporate millionaires to sign on as investors, she managed to convince the British transitional authorities in Zaire to allow her project to go through - the British happily accepting just for the prospects of investments coming in at all. The British would come to regret this decision years later.
By the 1960's, Rand's Objectivist experiment of Galtville, Katanga managed to prove surprisingly profitable so far for the Zaire government, the money that was coming in serving to stabilize the country's economy and fund the government's extensive infrastructure programs. Rand's ambitions for an independent Objectivist Katanga, however, would put an end to that brief period of prosperity...
This is where three other players enter the scene: the Federation of Rhodesia and Nyasaland, the Boer Afrikaners of South Africa, and the remnants of the 2nd African Corps.
Starting with the 2nd African Corps: after the defeat of Nazi Germany in 1945, the 2nd African Corps was left trapped in the Congo Basin with nowhere to go; after hiding what was left of their weapons and equipment in the Kibara Mountains, the Corps melted into the European colonial population throughout southern Africa - primarily the Katanga region and Northern & Southern Rhodesia. Staying in contact with one another, the former Nazi soldiers wormed their way into the political spheres of the colonial communities, settling themselves in to a comfortable lifestyle with steady incomes from corrupt officials. The arrival of Ayn Rand in Katanga, however, changed things: her secret buildup of a private mercenary army lent itself well to the strengths of the ex-Wehrmacht officers, and several of the Nazi exiles found themselves new jobs within Rand's mercenary forces; one of them decided to provide Rand the location of the forgotten weapons caches in the Kibara Mountains. While heavily outdated and neglected for years, the huge arsenal was free-of-charge, and so was a great boon for Rand's demented ambitions for Katanga. The weapons cache proving to buy them immense favor within Rand's inner circle, the ex-Nazis of the 2nd African Corps began to trickle in en-mass to Galtville, their presence having a growing influence on its internal politics.
Next to be involved was the Federation of Rhodesia: a longtime British colony, Rhodesia's leaders had spent the last few years preparing to wriggle their way out from Britain's leash and declare independence from the British Empire, allowing them to establish their own personal white-nationalist ethno-state without interference. Among those Rhodesians pushing to bring that dream into reality was Ian Smith, a veteran bureaucrat and administrator in the Rhodesian government, as well as a virulent racist and white-nationalist; Smith had connections with various members of the exiled 2nd African Corps as a result, and it was those connections that gave him an opportunity to build inroads with Ayn Rand in neighboring Katanga. Rand's mad ambitions had ended up instigating a proxy war between her, the Congolese government, the United Nations, and the Soviets: as the conflict dragged on, Rand steadily grew more and more deranged, becoming a totalitarian dictator engaging in various atrocities to maintain her rule; what she needed most, however, were more weapons and mercenaries to keep her independence war going... which Smith was more than happy to provide, funneling war materiel into Rand's hands and making her more and more dependent on Rhodesia's support to survive.
As Galtville met its demise under UN aerial bombings, Cuban-led Communist partisans, and Congolese army troops, with Rand herself meeting her end locked in a bunker ranting against the inferior 'mundanes' of the world and the collectivist-internationalist conspiracy, the Republic of Rhodesia declared its independence from the British Empire, and Ian Smith came to power as its Prime Minister; among his first acts was to send a 'peacekeeping force' into Katanga to seize control of Galtville. What little remained of the Objectivist society welcomed the newcomers, weary of several brutal years of war that had devastated the region. The United Republic of the Congo protested against this intervention, declaring it an invasion of their territory, but the UN had enough of the war in Katanga, and Rhodesia's intervention had near-immediately restored order to the area (earning them brownie points with the UN), so the subsequent peace-deal negotiations led to the Katanga province being annexed by the Republic of Rhodesia, which also earned itself international recognition... in spite of protests from the United Kingdom. This recognition of Rhodesia would prove ill-advised in hindsight, however, given that Ian Smith and his regime would reveal its true colors soon enough...
Lastly, we get to the Boer Afrikaners: in 1948, the National Party came into power in South Africa, marking the first time an all-Afrikaner cabinet controlled the government since 1910; the Afrikaners - notorious for their resentment against Britain and their racism against native Africans - soon got to work in implementing their racial segregation policy known as Apartheid, beginning a dark chapter in the history of southern Africa. The Boers had a history of pro-German sympathies spanning decades - the most recent examples being their opposition of South Africa's participation in WWII alongside Britain against Nazi Germany, personified by the
Ossebrandwag, a pseudo-Nazi paramilitary group - and this pro-German sympathy didn't end with the conclusion of the war: groups like the OB had developed ties with the 2nd African Corps during the war, after the war ended, those ties continued to exist into the 1960's, right around Ayn Rand's dream of an Objectivist Katanga finally collapsed and was absorbed into Rhodesia. As both South Africa and Rhodesia were connected by their ties with the 2nd African Corps, that association made the two nations natural allies, which made Rhodesia an attractive location to migrate to for Boer Afrikaners.
Thus it is with the amalgamation of Objectivist ideologues, exiled Nazi remnants, and Boer Afrikaner migrants, that we get the Independent State of Rhodesia, an abhorrent fascist state that blends together some of the worst ideologies of the 20th century - one that persists into the modern day against all odds.