Final answer:
The book that made Washington Irving internationally famous is 'The Legend of Sleepy Hollow'.
Step-by-step explanation:
Published in 1820, The Legend of Sleepy Hollow is a short story that follows the protagonist Ichabod Crane and his encounter with the Headless Horseman. The story has since become a classic in American literature and has been adapted into various films, TV shows, and plays. Washington Irving's writing style in this book, which combines elements of humor, superstition, and the supernatural, helped establish his reputation as a prominent author both in the United States and internationally.