There are a number of Chinese brands that are decent. Not marketing in the US does not equate to not being available.
Whenever I buy a phone I spend several months researching the market. The phones I buy are always built to last and have good transceiver sections. Since 2005 I have had an HTC Wizard, a five inch Dell Streak, and the Samsung Galaxy Note2. All still work although the screen seems so tiny on the Wizard now.
I make my machines last. If I have to pay more in order to get one that can, I will. And there will always be someone servicing that market.
I’m currently using the Note 4, which is nearly perfect in form and function. Of the Chinese brands, only Huawei is really worthwhile, if you trust them..