11 Januari 1908
- Theodore Roosevelt, Presiden Amerika, menetapkan Grand Canyon sebagai Taman Nasional dengan pembangunana Grand Canyon National Monument. Dalam pidatonya, Roosevelt menyebut Grand Canyon sebagai mahakarya teragung yang tak pernah boleh untuk dirusak atau disakiti. Inilah ucapannya.. ''The Grand Canyon fills me with awe. It is beyond comparison—beyond description; absolutely unparalleled throughout the wide world. ... Let this great wonder of nature remain as it now is. Do nothing to mar its grandeur, sublimity and loveliness. You cannot improve on it. But what you can do is to keep it for your children, your children's children, and all who come after you, as the one great sight which every American should see."