What if the Germans built a functioning nuke in 1944?
>>17996880 (OP)
They would have had to either used it completely untested, or test it and alert the allies that they had it. If the allies knew, then every bomber in range would be sent on a raid to reduce it's location to a fine dust. Like daily thousand bomber raids to one location. Even if they built it under a mountain, everything around the site would turned into a moonscape and the entrances buried under rubble. There's no world in which this works.
Also, they would have had to pull off refinement without the western allies knowing, which they couldn't do during the real war. They would have also needed to somehow build a bomb with drastically less resources and under bombardment faster than the Americans managed in the real world. The question requires so much to be different, and those differences so unrealistic, that an appropriate answer is "Captain America would stop it."
They would have had to either used it completely untested, or test it and alert the allies that they had it. If the allies knew, then every bomber in range would be sent on a raid to reduce it's location to a fine dust. Like daily thousand bomber raids to one location. Even if they built it under a mountain, everything around the site would turned into a moonscape and the entrances buried under rubble. There's no world in which this works.
Also, they would have had to pull off refinement without the western allies knowing, which they couldn't do during the real war. They would have also needed to somehow build a bomb with drastically less resources and under bombardment faster than the Americans managed in the real world. The question requires so much to be different, and those differences so unrealistic, that an appropriate answer is "Captain America would stop it."