The untold reason Japan surrenderedThe atomic bombings alone didn't end the Pacific war.

From the show

Hidden Sides of History

Geopolitical maneuvering and the threat of a two-front war played a decisive role in ending the deadliest conflict in human history. While nuclear weapons are widely remembered as the catalyst for peace, a sudden invasion by the Soviet Union eliminated any hope for a mediated settlement. This massive shift in power ultimately forced an immediate end to the fighting.