Which Harry Potter novel became the first book to sell one million copies in a single day in the United States?

Harry Potter and the Deathly Hallows became the first book to sell more than one million copies in a single day in the United States. The final Harry Potter novel was released on 21 July 2007 and set major first-day sales records.

Scholastic, the American publisher, reported that the book sold 8.3 million copies in the United States during its first 24 hours, an average of more than Books per second. The figure reflected enormous demand for the conclusion of Rowling’s story.

The record is sometimes confused with the novel’s worldwide sales or with the opening results of the film adaptation. The one-day statistic refers to U.S. book sales after publication, not cinema tickets and not all global sales combined.