If American patents are still valid, then China's products can't be sold in the United States, and conversely, American products can't be sold in China (without the permission of the patentee in the place where they are sold), because the protection scope of patent laws in various countries is regional. Obtaining a patent in China means that you have the right to use the patent in China (excluding Hong Kong, Macao and Taiwan). No unit or individual may exploit the patent without permission, including for commercial purposes. The same is true in America.
If you can be sure that the content of this China patent is the same as that of the American patent protection, you can declare that American patent invalid. China and the United States have no patent requirements at home and abroad before the filing date. Your patent was first published in China, but it is invalid in the United States.