if you own an American trademark, you can use it in many countries. If you register an American trademark and don't intend to use it in the United States, you need to indicate that the trademark you want to register is an intentional use trademark. Intentional use can be used as the basis for submitting an application in the United States, but not as the basis for registration.

after registering the American trademark, you can use it for your own use, and at the same time, you can also use it with domestic merchants who have not registered the American trademark, so as to earn the license fee that you deserve for allowing others to use your American trademark. This is also an effect that Chinese trademarks cannot achieve.