EMP is the Boogeyman lurking on the sidelines of the showdown between the PRC and the US led world systems.
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Electro-Magnetic Pulses (EMP) caused by airborne nuclear blasts have been a concern since the height of the Cold War. The EMP surge could potentially knock out all electronics over a vast area of the United States.
China just conducted a test (see article below). This is not good on several possible angles.