Question: is David McCullough or Nick Hornby an American author?
Sentence (from "The Greater Journey"): Other subjects include Elihu Washburne, the American ambassador to France during the Franco-Prussian War, Elizabeth Blackwell, the first female doctor in the United States, and American artists who worked in Paris such as George Healy, Mary Cassatt, and Augustus Saint-Gaudens.
Relevant evidence: No