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Assuming WW2 starts as per OTL and european scientists flee German dominance as per OTL and both UK and US express same level of interest as per OTL, say up to late 1941 when FDR OKs the project. What is the earliest time workable nuke can be fielded? And assuming rest of war goes as per OTL (no reason why it shouldn't) what would be the target?
You can load the dice as much as realistically possible but any ASB will be shot on sight.