the conclusion of the war in the pacific, now there's a debating point. the capitulation of japan was probably hastened by the use of nuclear weapons. or was it?
a ground invasion of japan would have been difficult, since so few areas of the coast were suited to an amphibious landing, and defence would have been concentrated there. but would operation downfall have realised the level of casualties forecast, ie more than the 200,000 killed by the bombing of hiroshima/nagasaki?
on a wider note, had the world not witnessed the appalling destructive capability of oppenheimer's toy, would they have been readily deployed in the cold war?