How to switch apple store from China to us
Switch from apple store coma to us
iPhone 5s, iOS 12
You need to have a new Appe ID that its country is US. (I think the most important part in this new ID is a card that can buy app or Apple music subscription in $ and a US billing address.) Then sign in with this new Apple ID. The system can change your store content to US App store automatically. You can still use this way to log in US App store in Mainland China.