re: What would’ve happened if Britain had surrendered in WWII?

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Another interesting though is the timeline for American victory in the Pacific. Would the full force of the American ground forces speed up victory in that theatre? If so, how many more casualties do the Americans suffer in the Pacific by having to attack the main island with an amphibious assault? In this scenario the timeline for the Manhattan project remains unchanged.

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to expand on this, i dont think there would be much of a difference except in the resources devoted. the pacific war was almost exclusively a naval and marine war. the war in europe was almost exclusively an army war. they dont have much cross over that would swing the other way.

as for the Manhattan project, it wasnt doing well and only had success after we spirited out german scientists and data to give us our "break through". if we arent involved in the war in europe, we dont bring in those scientist to help us or the research data needed to solve the puzzle. without what we got from germany, it takes us at least another 2-3 years to get the bomb, by then the war in pacific is over.

in contrast we "barely" beat germany in getting the bomb and we ONLY achieved that through our massive war efforts directed specifically just to slow them down. germany would have had the bomb about the same time we got it but in that situation we would still be 2-3 years from getting there.