The Atomic bomb was correctly seen as such a jump forward in modern weaponry that it would end the war with the holder of the weapon being the ultimate victory.
This proved to be true as the dominant powers after the War were the two nations that had the weapons (US and Soviet Union).
The Allied strategy for winning World War II was they planned to retake North Africa to invade through Italy, invade France from Britain and Germany from the Soviet Union, and then combine forces to defeat Japan.
