"An EMP is not magic and won't just go ahead and fry stuff. I"
IIRC "Starfish" in 1962 caused the Hawaii power grid to fail.
EMP pulses have faster rise times than lightning. That means they are high power, broadband (in the sense of wide bandwidth, not the PR term for ADSL) signals.
They can fry a lot of stuff, and with the ongoing creeping of badly designed IoS and embedded systems more of the worlds societies become more vulnerable, although I'd guess the US leads the pack.