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WI US development of nukes is delayed a bit, a few months? Say trinity fails but scientists realise what's wrong and how to fix, however it will take time. How long could "Downfall" be postponed while waiting for nukes to become operational? If nukes are being delayed would invasion still happen, US commanders not willing to wait? If invasion happens (say roughly OTL timeframe) and nukes become available after invasion but before Japan surrenders does US use them?

How does this affect post-war situation?
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