This has been largely known since the 60s, when the Starfish Prime exoatmospheric nuclear test knocked out all communications and damaged power grids over the P

This has been largely known since the 60s, when the Starfish Prime exoatmospheric nuclear test knocked out all communications and damaged power grids over the Pacific. https://en.wikipedia.org/wiki/Starfish_Prime https://en.wikipedia.org/wiki/Starfish_Prime