1. Whether this American patent is applied in China or not, the same technical content will affect the re-application of patent in China. However, the technology disclosed in this patent can be legally copied in China, because it is an open technology. If you don't apply for a patent in China, you can't get protection in China.
2. If your patent application is only partially the same as the American patent, you can obtain a patent authorization by modifying the claims in the application, deleting the same part and retaining the innovative part of this application.