Though the iPhone is designed and developed in the US, most components are produced from suppliers all over the world.
Each supplier provide their most advanced product to compete for a supply contract from Apple.
Asia Supplier:
America and Europe Suppliers：
Raw minerals from the Democratic Republic of Congo and adjoining countries may contribute income or other benefits for the armed groups that violate human rights. These minerals are called “ conflict minerals”. (“What are Conflict Minerals?”)
Apple announces “ The ethical sourcing of minerals is an important part of our mission to ensure safe and fair working conditions”.( Apple Supplier Responsibility 2014 Progress Report)
Apple really pays attention to their social responsibility. Though raw materials source are eventually depend on their suppliers, Apple tries every effort to require all suppliers to use only conflict-free minerals and bring benefits to local people.
Samsung expands its production to the company’s Austin, Texas facility and its partner GlobalFoundries’ New York plant in the near future. (macrumors)
The aim of Samsung is to achieve supply contracts from Apple and compete with other rivals. Like Samsung, many other foreign companies expand their facilities in US and local companies also improve their capacity. In other words, such healthy competition boosts US production.
GT Advanced Technologies is an example. Though they invest credits gained from Apple into their new facilities in Mesa, Arizona, an effort to bring production back to the US, they eventually faced the case of liquidation.( mercurynews)
Healthy competition doesn’t mean every company that boosts US production can gain profit. Even they may face bankruptcy.