The book “lights out” gives an eye-opening look at this in terms of the electrical grid. Apparently, there are many transformers that can only be manufactured b

The book “lights out” gives an eye-opening look at this in terms of the electrical grid. Apparently, there are many transformers that can only be manufactured by a couple overseas manufacturers, sometimes with 18+ month lead times. And some of the infrastructure needed to deliver these parts (e.g., railways) don’t even exist anymore.