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EMP would not affect devices that aren't connected to the grid. Atleast I don't think it would, and even if it did, there's still plenty of older diesel powered machines that don't need electricity to run such as some diesel heaters. If nothing else I could trade it for something more useful then.
EMP affects all electronics as long as it’s in line of sight. With that said EMPs are not a very effective way to knock out power for the entire US.
You’d have to launch nukes up into the sky and detonate them in the air in order for an EMP to be effective. You’d need to use several of them spread out across the US.
The chances of that happening are super low unless it’s our own government doing it.
The question said all electronics are dead forever. I agree that it's not a realistic scenario but it is what was asked..