Final answer:
The category of the Pulitzer Prize that allows the author to be of any nationality as long as the work is about a U.S. topic is Letters.
Step-by-step explanation:
The category of the Pulitzer Prize that allows the author to be of any nationality as long as the work is about a U.S. topic is Letters. In the Letters category, works of fiction, nonfiction, and poetry are eligible for consideration as long as they meet the criteria of being about a U.S. topic. This allows authors from around the world to contribute to the understanding and exploration of American life and culture through their writing.
Learn more about Pulitzer Prize's Letters category