Suppose the Ultimate Worst Case scenario arises in the Eastern front with Nazi Germany getting everything west of the Urals after defeating the USSR and the Japanese Empire making headway into China and becoming capable of making raids on Australasia.
Could the Allies Still Win?
The long answer is yes, but it would take them longer, probably another 5 or 6 years, and cost much more in both lives and money.
5 to 6 years? 5 years would see all of Germany reduced to radioactive dust. The USA was cranking out 3 A-bombs a month by August of '45, and had the wartime buildup of reactors continued, you could easily see over a hundred Bombs in '46, and more yet each year after.
That said, nuking Germany to collapse might be the only way to win the war in the West. Japan can be starved out easily enough, but Europe can't, and landing on a fortified shoreline is so difficult that it's probably impossible with a lot more German divisions on station.
This is of course a quite optimistic estimate, since it is rather doubtful that America could ever build nukes at a much faster pace than OTL in the mid-late 1940s. Moreover, the air defense of a victorious intact Axis shall be much more efficient than 1945 prostrated Japan. It is quite doubtful that the Western Allies could ever achieve anything more than air parity over Europe at the very most. Therefore, America shall have to deploy hundreds of nuke bombers just to have a decent chance of hitting an handful of Axis cities. And according to OTL nuclear buildup pace, America won't have several hundred nukes till 1948-49.
That just ends the war even faster, since Germany could never hope to compete in a WMD duel, not with allied aircraft controlling the skies and fighter bombers smashing any missile launch site after only a few shots. Considering the horrible accuracy of those missiles, and the unpredictable performance of nerve gas (no, Germany can't field any dirty bombs of any use), Britain would only suffer limited losses before Germany's industrial centers were radioactive ruins, and everything else is covered in mustard gas.Last but not least, a victorius Axis shall have the ability to hit British cities at leisure with nerve gas and quite likely "dirty bombs" too missiles since 1944-45. That makes for a rather effective MAD deterrent.
One thing about German victory in Europe but US nuke scenario is that it ignores the great power of Germany to fight a counter air war with the US and set up mutual detterence. By the time the US is ready to A bomb Germany Germany will have the full gamut of wet-dream weapons that never got the resources they needed but still make us salivate. With the USSR defeated these weapons will get a good chunk of the resources they need to make them successful.
Personally I could envisage V2 and A234 evolutions being used against the B29 airfields, and Me262 and Ta152 fighting for air superiority over western Germany. I could also envisage Germany threatening nerve gas attacks on a large scale against Britain and a small scale against the US if they are nuked. It's not a simple 'nuke em' scenario.
This is of course a quite optimistic estimate, since it is rather doubtful that America could ever build nukes at a much faster pace than OTL in the mid-late 1940s.
Moreover, the air defense of a victorious intact Axis shall be much more efficient than 1945 prostrated Japan. It is quite doubtful that the Western Allies could ever achieve anything more than air parity over Europe at the very most. Therefore, America shall have to deploy hundreds of nuke bombers just to have a decent chance of hitting an handful of Axis cities. And according to OTL nuclear buildup pace, America won't have several hundred nukes till 1948-49.
Last but not least, a victorius Axis shall have the ability to hit British cities at leisure with nerve gas and quite likely "dirty bombs" too missiles since 1944-45. That makes for a rather effective MAD deterrent.
Using nukes tactically to break through the conventional defenses of the Axis has in all likelihood better chances of success than nuclear bombing of the cities, but it still faces the problem of Axis WMD missile retaliation on British cities.
Not to mention that an intact Italy shall be able to complete the modernization of its military since 1943, and shall hence be a rather bigger asset for the Axis and tougher opponent for the Allies.
See, this is what's bad about Bill Cameron being banned. He's the best at pointing out exactly why those wet dream weapons were just wet dream weapons. The USSR had little to do with it. Hopefully someone else (Calbear, maybe?) will step in and take over that task.
This time around production will continue until the war is over. Suspect that xchen08's suggestion of 3 a month may be somewhat high but they will produce enough by mid-late 46 at the latest to critically cripple Germany.
Suppose the .....
Could the Allies Still Win?
Yes. They force German surrender shortly after the 6th August 1945.
Japan a touch later.
Post war things look a lot different as the Soviet Union (assuming it still exists) takes years to get back into shape and doesn't puppet Eastern Europe.
I’ve noticed people have been talking ‘’hardware’’ I.E industry and weapons I dont see much talk of ''software'' I.E morale and political will.
I stongly doubt that the US public wil be willing to face the hard slog that fighting through Nazi Europe would in entail in the long term. We often tend to forget just how much effort the Germans sent to the Eastren Front in sheer terms of manpower and effort. All those millions of battled hardened troops would now be facing the US-British Armies, which struggled to make headway against whatever Germans could scrape to greater in 1944. You think they can do better with the bulk of the Wehrmacht and Luftwaffe facing them because I dont.
Hitler dosnt need doomsday Wweapons as the war drags on with no end in sight and a direct invasion of Europe a very dubious prospect without the U.S.S.R to tie down the vast majority of Axis forces. There is a good chance that the WA will sue for peace at some point.