" ask yourself what makes iPhone an American product. "

That it was designed in the US and the product parts are build based on specifications developed by apple.

If an Italian buys a Mercedes and puts a Porsche engine in it, you may call it an "Italian car" but there is much less know how in it than is required to develop a car.

"Suppliers can change." For complex items there are often few suppliers in the world. For some items there may be even only one.

International Innovation Index - Large and small country ranking https://en.wikipedia.org/wiki/International_Innovation_Index Turkey ranks position 58