What you say is primarily about business, but also “Globalization”. Politics and economy work in tandem.
Broadly, there are 4 elements I can think of right now in relation to aspects of your post:
1. Capability/Production/Operation
2. Cost (then, Price)
3. Opportunity
4. Dependency
In business terms, the U.S. is a huge market within itself.
But the U.S. is also very much dependent on opportunities outside the USA. Otherwise, the U.S. today, on the world stage, would be what it was pre-WW2 — politically, economically and socially.
“otherwise, the U.S. today, on the world stage, would be what it was pre-WW2 — politically, economically and socially.”
You say that like it’s a bad thing.