Why doesn't apple have their own foreign factories?

The other tech manufacturers have their own factories, especially Samsung that makes some parts for the iPhone.

Why doesn't apple hire people with a lot of knowledge in opening factories in foreign countries and then open their own factory to make even more money?

Samung has extensive history and experience in the region that Apple does not share. That said, I'm not exactly sure on Apple's reasoning, but in general putting more into PP&E is not always the best choice.

Its not always the best way, they have entire departments figuring stuff like this out so I'm sure they have their reasons. They do have a ton of design and manufacturing in the US, CA, AZ, etc