Originally Posted by Uncle_Sam
Many of people I talk, say it wasn't really essential to use the Nuke. I don't agree, the Japanese saw the power of the big one and capitulated, it just made much less US casualties.
But there is other question: Was that to show Soviets that after WWII they shouldn't mess with the West!
US strategic planning for casulties for any land invasion of Japan was put, conservatively, at 1 MILLION men DEAD just on the US side.
So yeah, it was absolutely neccessary.
You should know that, had relations broken down between Stalin and the Western Allies in 1945, the Red Army IMO could have driven all the way to the Atlantic, shattering the Allied armies in the process. So there's an element of truth in that it was designed to show off to the Soviets. Only a small element mind. The main reason was to cow Japan into a quick surrender and it worked.