1. Japanese Self Defense Force & Saderan Empire (Gate)
Japan and Saderans get rolled unless the magic they find on the other side of the gate can asspull something decisive. Which seems doubtful.
2. Every country in Africa & Middle East (Resident Evil verse)
There haven't been many Middle Eastern settings in Resident Evil despite the irony of RE lore stating how the War on Terror helped proliferate Bioterrorism, hence the BSAA and the like. Outside of Resident Evil 5's Kijuju Region, most of the settings tend to be in Eastern Europe like the Eastern Slav Republic in
Resident Evil: Damnation or Sejm Island in
Resident Evil 2: Revelations for example. With sprinklings of other locations of course. Super America rolls Kijuju.
I think Bioweapons are actually a weakness of these Super Americas. GTA America doesn't really have anything special to deal with it beyond generic Hazmat/NBC stuff, CoD America has lots of surveillance assets but nothing specifically bioterror countered and poor Fallout USA suffered from things like New Plague as well as widespread Chinese infiltration in the lead up to the Great War culmination.
But Las Plagas isn't quite as hard to contain IMHO, especially with the military forces that Super America can bring to bear. Drones and robots and power armor will help contain the infection and root out the Plagas pretty reliably IMHO.
3. East Hemisphere Nazi Earth (Wolfenstein)
Wolfenstein infantry are pretty decently equipped and armored and they have a variety of technology including mechs, cyborg dealios, panzerhunds, tanks and giant airships and U-boats. Plus space travel capability including to Venus apparently. Whatever.
On the other hand, they were taken out of North America by some plucky idiots. I don't have much respect for Wolfenstein II's storyline. It reached anime levels of ridiculousness soon enough and I think the secret Da'at Yichud Jewish technology really carried them a lot.
I think the Fallout tech infantry wise broadly compares to that of the Nazi Germans. I think Power Armored troops (and Sentry Bots) compare pretty well to War Robots and superior to almost all German infantry. Then there are the giant mechs, which naturally Fallout America has some issues with, but you still have the vast mechanized and armored forces of CoD and GTA Earth, as conventional as it is, to engage in some proper combined arms operations. Fallout provides the infantry, the other two provide the other branches.
The other asset working on behalf of Super America is that Black Ops has lots of special forces, so they can operate in a manner similar to that of the Kreisau Circle and other insurgents and since there is a lot of restlessness in Nazi Occupied territories, I think they would be very effective. They could even engage in computer hacking and other surveillance programs as well, helping win the intelligence war, which was key in OTL World War Two after all.
It won't be easy and it'll be a War that takes years, but Super America would prevail rather assuredly in the end I feel. Just like in OTL Second World War.
4. Russia (Command & Conquer verse)
Red Alert Soviet Union would be the real challenge. They have superweapons and supertech like Fallout... BUTT it doesn't stop with Mini Nukes, power armor and war robots. In addition, the Soviets have super tanks, terror drones, mega naval ships and airships, psychic weapons and magnetic satellites that look like they could come out of
Spaceballs!
Granted their leadership seems to be about as smart as
Fallout 2 Enclave was... but that just makes things more colorful. And it's not like the Allies or Empire of Japan were passing all of their intelligence checks either. So it's possible for Super America to win. But they would actually be at a technological disadvantage in some respects.
Super America's power armor troopers would be almost unchallenged, though the Soviet Union has their own power armor troopers, the
Tesla Troopers! And Tesla Troopers are meant to be elite, and designed to eliminate enemy armored vehicles, especially tanks. Power Armored troops and heavy war robots will be having a bad time fighting those. Plus there's the heavy armor.
Apocalypse Tanks,
Tesla Tanks,
V4 Rocket Launchers,
Hammer Tanks,
Terror Drones!!!1
Unfortunately in armored ground warfare GTA America and CoD America are fairly conventional. Rhinos and Abrams aren't exactly future tech. But unlike Fallout USA, which has poorly defined space and aerial capability beyond it existing, GTA and CoD have lots of aircraft. GTA America has a full suite of aircraft ranging from utility and attack helicopters as well as
strategic bombers,
ground attack aircraft,
two different military VTOL jets, and the multirole jet the
P-996 Lazer. Even trainers and giant cargo planes and gunships.
Likewise CoD America has all sorts of similar modern capability, but also
stealth helicopters, a plethora of drones and
UCAVs including a high altitude stealth one, the
Lodestar. They also have orbital satellites capable of real time close in tactical support. When it comes to detection and the like, CoD will be helpful in that regard. Soviet Air Forces are really limited in that way beyond utilizing their deadly Kirov Airships (which are mainly just terrifying bombers) and lots of
modern MiGs.
Naval wise the Soviets have powerful naval ships, but so does Super America. We know Fallout USA has naval capability. They had aircraft carriers after all. GTA America also has conventional carriers, amphibious assault ships, but also patrol boats, fast torpedo boats, and even its own submarines... which lack feats sadly. CoD also has aircraft carriers, or at least one, named after the greatest President of all time,
Barack Hussein Obama.
This'll be a tough War I think and every bit the challenge filthy Red China gave and with RTS logic, the industrial capacity can out wank even Super America... but Fallout has a strong industrial base and with the combined arms the other two countries (who aren't slouches in the military industrial complex either) will offer, combined with a likely parity in Sea Power capability, and Super American Air Superiority, maybe they can overcome the Soviet Union, especially when Fallout America's later technology starts kicking in if this War lasts even longer.