Comment by dTal

That's the popular narrative, yes. I've seldom heard a historian endorse it. Rather, the evidence suggests that the surrender was primarily triggered by the Soviet Union's declaration of war.

https://foreignpolicy.com/2013/05/30/the-bomb-didnt-beat-jap...

Note that it's in the interests of both countries to promote the Bomb narrative - America to justify the financial and moral cost, and Japan to justify the loss of the war (a black-swan wonder-weapon being a less shameful reason for defeat than military incompetence). But in truth, Japan's cities had already been firebombed to smithereens - in that context the Bomb wasn't really all that shocking.