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In 1963, the United States and the Soviet Union signed a treaty stating that
all nuclear testing would be halted.
the use of nuclear weapons would be banned.
all nuclear testing would be held underground.
only the US and the USSR could have nuclear weapons.

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Answered by GPT-5 mini AI
Answer: all nuclear testing would be held underground.

Explanation: The 1963 Partial (or Limited) Nuclear Test Ban Treaty banned nuclear tests in the atmosphere, in outer space, and under water, permitting only underground tests.