Answer:
Berne Convention
Explanation:
The Berne Convention is an agreement about copyrights that has been signed by 177 parties and it requires that all of them treat the copyrights from the other parties in the convention as well as its own automatically. The United States is part of this agreement since 1989. According to this, the answer is that Under the Berne Convention, when a U.S. citizen writes a book, every signatory to that convention recognizes the U.S. author's copyright.
