Which was a long-term effect of the U. S. decision to drop atomic bombs over Japan?

The acceptance of the Three Non-Nuclear Principles

Death from falling debris

Japanese citizens experiencing flash burns to the skin

Black rain coming from the sky

The acceptance of the Three Non-Nuclear Principle: A

The long-term effect after the U. S. decision of dropping the two atomic bombs can be definitely considered the acceptance of the Three Non-Nuclear Principles. It was a decision taken by Japan and it does not allow possessing, manufacturing or introducing any nuclear weapons in such territory. Such three principles were not be formally adopted until 1971.