Grizzly bears are protected!
When he returned to Washington, D.C., Hayden gave more than 400 pictures of the Yellowstone area to Congress. His written report was more than 500 pages long. He believed that Yellowstone was so special that it should be protected for all time. He was able to make congressmen and senators understand this.
On March 1, 1872, President Ulysses S. Grant signed the Act of Dedication. This act made Yellowstone the first National Park in the whole world. This meant the land, the water, and all living things would be protected for all time to come. Now all people had a place to go to enjoy life through outdoor recreation for all time to come, too. We call this preservation. Over 2 million acres are protected inside Yellowstone National Park.
At first the park had little protection from poachers and vandals. Then in 1886, the park came under the protection of the United States Army. The army served the park as its protector, but something was missing.