To be honest that’s how i played most of my US games. Now i feel bad.
Well, it is certainly something that I think is fully in-character for the United States government to do. After all, it is the pragmatic and logical solution to what is going on in Africa, with OFN walking out of this having won their first post-WW2 conflict as an alliance. They have achieved their stated objective of defending South Africa from Nazi invasion, with the country now serving as a base of operation that will allow OFN to expand their operations in the Indian Ocean, not to mention bieng totally under American's political and economic orbit. Hence, the POTUS will now be able to focus on his domestic agenda, not having to spend further blood and treasure in Africa beyond guarding the now expanded South African boarder.
... As long as you don't mind the fact that Hutting is committing Khmer Rouge level genocide against millions of Africans, and will most likely devastate everything south of Ethiopia and north of Harare/Salisbury in a way that is on-par to what Tabby does to Russia.
But again, from a McNamara style pragmatist that only cares about numbers on a spreadsheet, he will say that:
(1) As terrible as Hutting's Reichsstaat might be, he is not part of Germany's Einheitspakt. Meaning that geopolitically, it will not be a threat to US national interests as it turns half of Africa into a giant void of madness and suffering. If anything, it will be a massive propaganda victory to discredit the any future anti-war movement or ciritsim of American foreign policy
('See? We could have won the war with a total victory, but those damn NPP hippies and their Yockey buddies forced us to sign a ceasefire, condemning millions of Africans to get murdered in mass graves. Which is why you should support [Insert US police action/military intervention here]').
(2) Even if all the OFN Mandates worked out in the best way possible and successfully decolonized, it was implied that much of Africa will still be a dysfunctional and chaotic mess due to the damaged done via the legacy of European colonialism under the British and the Belgians, the decades of Nazi rule under the RKs, and the SAW. A mess that you bet you ass the L-NPP types WILL absolutely be blaming on America's
'capitalist exploitation/systemic racism/sexism/elitism, etc', while the Yockey types will say that the SAW and the Mandates were done for the
'interests of the Wall Street bankers/ZOG'. The fact that even the worst case scenario for the OFN Mandates would be vastly better compared to the Hutting's Reichsstaat is irrelevant, since there is no way for people in-universe to know that, plus, the L-NPP types would outright reject any idea that America is anything less then a Nazi Germany with better PR, while the Yockey types would actually consider the idea of million of dead Africans to be a good thing that they not-so-secretly wank off to. With a Pro-OFN ceasefire, the US can simply go,
'This is not by business' at the slaughter. After all, the L-NPP types have already hitched your wagon to the anti-war movement. What are they going to do? Pull a full 180 and condemn the US for NOT intervening more in Africa?
(3) Even the best OFN total victory scenario will see thousand of additional dead American soldiers. Sure, you would be saving millions of Africans from Hutting's Reichsstaat... But at the end of the day, those millions of Africans would not be voting in American elections, while the thousands of extradead American soldiers and their family WOULD.