A U.S. trademark application or registration can be used to apply for an international trademark if the owner of the trademark has a personal or business connection with the United States. This means that one or more of the statements below is true:
The trademark applicant is a national of the United States.
The trademark applicant has a domicile in the United States.
The trademark applicant has a real and effective commercial establishment in the United States.
If none of the above statements are true, you will not be able to use your U.S. trademark to file using the Madrid system.