Without the
Frisch–Peierls memorandum and the approaches from the British to the Americans there may never have been a Manhattan project and an American atom bomb. And if both Britain and Russia had fallen, would the B-36 actually have been built - except as a weapon against Japan?
And If Britain had fallen, or conceded, Rommel would have taken the rest of the Middle East and, as planned, the German army would have taken the oilfields of Persia instead of later having to rely on Ploesti and artificial fuel. And the Middle East was seen as the gateway to India - and perhaps that might also have fallen to either Germany, or more probably Japan.
20-20 hindsight again.
https://en.wikipedia.org/wiki/Britis...hattan_Project