I wasn't asking about their system, I was asking about yours, because detonating a nuclear device above the US to destroy their electrical systems would probably be met with nuclear retaliation.
It will blind most of the US. A lot of military hardware is EMP-hardened. :cool:
(Not to mention that the only effective way to generate an EMP is to detoante a nuke, which technically means you've just used a WMD against the United States... How good is your anti-ICBM tech? :D )
Geostationary orbit is a very big place, and in turn is very hard to get to. You'd have to be very well-equipped to get anything up there, let alone the budget to cause any lage amount of damage.
Living forever as a human would be boring anyway. I'd much prefer acheiving nigh-eternal life the long way around, i.e. sufficiently advanced technology. :D