Scotland is not the USA. A economically self sufficient USA basically conquored the world in 1945.
Because the rest of the world was bombed, their infrastructure ruined, and manpower shortages because of the loss of life. We were basically the only industrial country left standing in 1945.
An economically self-sufficient German Reich didn't. The US had the resources of the Western Hemisphere to draw on: rubber, tin, copper, etc.
There is much to be said for "reshoring" industries and bringing back American manufacturing, but you are acting like a troll.