Premise number 1 is no longer functional.
Premise number 2 doesn’t matter if the US loses the bulk, even if not all, it’s electrical infrastructure.
Texas might survive it. Most don’t know this, but the Texas grid is free-standing. They may have been smart enough to buy back up transformers and mount them in place so that they can reconnect the transmission lines a day after an attack.
That’s all it would take in a lot of cases. Generation spares is another issue.
Nope, they weren't smart enough to do that
Most of what I read on this thread is people articulating their hopes.
Well, hope is not a plan.