Naturally Apple guards its cost structure closely, but many people have tried to make educated estimates. The typical iPhone costs about $160-$400 for the components (depending on model, memory size, display, etc). Other than the processor, the rest of the major components are from outside sources. Even the Apple processor is manufactured by a third party fab (TSMC - Taiwan). The most expensive component would be the screen (Samsung). About half of the other major component suppliers are foreign and most of the rest manufacture overseas anyway (Qualcomm, Broadcom, Cirrus, Skyworks, Bosch, ST Micro, Murata, Sunwods, ALPS, Toshiba).
On top of that we have R&D, assembly, packaging, distribution, marketing, and other overhead costs.
Is Dotard suggesting that Apple only purchase American components? Does he even have a remote clue how the supply chain of modern electronics works?