I am drawing a line between what could still be manufactured if US borders closed today and what couldn’t. Rain comes from water outside the US borders but a war isn’t going to stop rain the way it might stop platinum imports.

Copper can be sourced inside the US, if you didn’t then you have a foreign dependency in your supply chain which is something the DoD actually cares about for obvious reasons.

Any other definition is just meaningless marketing crap like “The Best” which is legally meaningless.