On Sept. 23, 1992, the last full-scale underground test of a nuclear weapon was conducted by Los Alamos National Laboratory at the Nevada Test Site. The test, code named “Divider,” was the last of 1,030 nuclear tests carried out by the U.S. Shortly after Divider, President George H.W. Bush signed Congressional legislation that mandated a nine-month moratorium on U.S. nuclear weapons testing, a mandate that has been extended by every subsequent U.S. President into the present day.

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