The U.S President Theodore Roosevelt became acquainted with the naturalist John Muir in 1903. Muir guided the President through the Yosemite wilderness, and convinced him to establish the Yosemite National Park, the first in the country. Muir opposed the damming of the Hetchy Hetchy Valley, known for its granite formations, and wrote to Roosevelt against it. However, Roosevelt’s successors, not Roosevelt, approved the dam. So the two did not had a solid disagreement.