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How can the invention of nuclear weapons be delayed till the 1950s or 60s ?

I need this for my upcoming TL.

What POD would you recommend ?

NOTES :

1. The reasons for delaying the bomb have to be different, than scientific. So... I need political, social, military or other reasons, why they won't be either discovered or used by the time of WWII.

2. The WWII of this TL ends earlier - in late autumn 1944.

Thanks in advance for any suggestions.
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