wrote


We import a large percentage of a lot of stuff, both raw material and
finished goods. Coffee. Rubber. Titanium. Tin. Wolfram. Textiles.
Clothing. And, yes, even oil.

Yup. Some of that isn't a good idea.

Which part is a "not good" idea? Why?

We also export to other countries a large percentage of their needs.
Food (wheat/soy/corn/meat/dairy products). Lumber. Technology.
Education. Medicine.

And again - some of that isn't a good idea.

Whic part is a "not good" idea? Why?

.... These systems were so extensive that about 100 years
ago, a traveler documented a trip from New York City to
Chicago that used trolley lines for more than 90% of the
distance.

I can still ride a train from New York to Chicago. I'd rather fly. (I doubt
the " 90% trolley line" story is true.)

73, de Hans, K0HB