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Avoiding ASBs or Axis supervillain sabotage, what plausible external events could have delayed the completion of the atomic bomb?

Discussions on multiple forums going back several years seem to sconvincingly describe the US as the only major power capable of committing to such a speculative project, and often, in what-ifs where Axis conventional resistance is stronger, the August 1945 completion of the atomic-bomb is treated as fairly fixed, resulting in game-ending bombings within a period of a few months.

Would any of the following events have plausibly resulted in a decrease in priority for the Manhattan Project and a consequent delay of its completion?

Germany not getting into war with the USSR, Germany defeating the USSR, An American loss at Midway, Failure of the Torch invasion, failure of D-Day invasion, Soviet-German separate peace, earlier collapse of Germany at Soviet hands
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