What was America’s first national monument? July 26, 2020February 25, 2012 by Pamela Landy The Devil’s Tower, Wyoming, established by President Theodore Roosevelt in 1906, was America’s first national monument. Related Answers Where is the Dinosaur National Monument? When was Sixth Avenue renamed Avenue of the Americas? How many films did John Ford shoot in Monument Valley, on the Arizona-Utah line? Which came first, the New York Film Critics or the National Society of Film Critics? How many national forests have been established in the United States? When was Thanksgiving made a national holiday?