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Hiroshima and Nagasaki
were warning shots.
Japan was already defanged.
Even after the bombs, Japan did not surrender
unconditionally.
They surrendered
on the condition that the Emperor be treated with respect, something that the US refused previously.
The US accepted this condition,
on the condition that the Emperor obey MacArthur.
We
had the bomb. The US, especially General Leslie Groves, needed to move the bomb from the shadows onto the world stage.
No peace before that.
See “
House of War” by James Carroll.