Theodore Roosevelt never said the Grand Canyon was "a sight worth trading the whole state of Texas for."
The quote appears in blogs, social media, tour guides, and even some park literature. It's attributed to Roosevelt's 1903 visit. The sentiment fits his conservation rhetoric—he did call the canyon "the one great sight which every American should see."
"Leave it as it is. You cannot improve on it. The ages have been at work on it, and man can only mar it. What you can do is keep it for your children, your children's children, and for all who come after you, as the one great sight which every American should see."
He established Grand Canyon Game Preserve (1906) and Grand Canyon National Monument (1908)—the legal foundation for National Park status (1919). He protected 230M acres total. The real quote—and the action—matter more than the myth.