I respectfully disagree. In the 12 months following a nuclear war, Americans would still need to file their taxes before the April 15 deadline, the federal and state governments would still have to pass annual budgets, software vendors like Microsoft and Apple would still need to push updates to their products, homeowners would still need to pay their annual property tax bill, people would still need to refill their drug prescriptions.... life could recover and go on. I'm not convinced that a nuclear war would be so destructive that civilization wouldn't survive. Most nuclear attacks would probably target missile silos in rural North Dakota and airbases anyway, not cities.

But, as I outlined in my comment, there are situations other than nuclear war where the US might want to restart nuke production.