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A 'US-Made iPhone' Is Pure Fantasy
(www.404media.co)
This is a most excellent place for technology news and articles.
I have no source, but I remember seeing a graph of where iPhones sell and places like China/India were 80% android phones (mostly Samsung I think).
I don't think the asian marketplace puts Apple products in such high regard as the US.
Samsung phones are still premium, I think they appeal more in other countries.
I see what you mean though with 20% of just China being almost the US population, but they are still losing 300m customers.