The last US nuclear weapons test took place on Sept. 23, 1992, at the Nevada Test Site. It was the 1,030th such experiment, the most conducted by any country since the first US atom bomb was exploded in 1945.
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The moratorium would be continued under president Bill Clinton and eventually extend into the global treaty banning nuclear tests, the Comprehensive Nuclear Test Ban Treaty, in 1996. Though 183 nations have signed on, the US has yet to ratify the convention and bring it officially into force.
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The unintended consequences of testing are still being felt today: Fallout from the Nevada experiments was likely responsible for the deaths of as many as 690,000 American civilians, according to new research into the radioactive contamination.
The only nuclear weapons tests in the 21st century have taken place in North Korea. The program there is the subject of fraught diplomacy as South Korea and the US urge strongman Kim Jong Un to move toward denuclearization.
Read more at The last US nuclear weapons test took place 26 years ago today
