Short answers, pulled from the story.
The first nuclear weapon detonation occurred on the 16th of July 1945 over Alamogordo, New Mexico. This event marked the first detonation of a nuclear weapon by the United States during World War II.
As of 2024, nine countries possess nuclear weapons with six others agreeing to nuclear sharing agreements. Roughly 40 countries maintain defense policies linked to nuclear armament through NATO membership or bilateral treaties.
These bombings caused injuries resulting in approximately 200,000 civilian and military deaths. Survivors suffered from thermal injury, blast effects, and super-lethal radiation exposure within the first nine weeks.
Louis Slotin suffered a similar fate nine days after an accident on the 21st of May 1946 involving the same plutonium-gallium core known as the demon core. He died from radiation poisoning following this incident.
The Comprehensive Nuclear-Test-Ban Treaty was signed in 1996 and prohibits all testing but requires ratification by 44 specific states. This treaty aims to restrict nuclear activities globally while allowing non-military technology transfer.