Question

What was the event that caused Japan to surrender to the Allies, thus ending World War II?

Answer 1

The last Japanese War Cabinet was created to bring Peace. It was a difficult and dangerous process. It Atomic bombs did not create the impulse to peace, the process was already happening.

Explanation:

The bombings of Hiroshima and Nagasaki had some effect on the political process but the drive for a peaceful end to the war was a political process that started long before the bombings and did not necessarily require the bombings to complete.

https://en.wikipedia.org/wiki/The_Emperor_in_August
A movie worth seeing.

Which is a remake of the Book "Japan's Longest Day" describes the difficult process that Emperor and Cabinet went through to bring about a Peaceful end to the War.