Yellowstone National Park is an American national park located in Wyoming, Montana, and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872.

Why Yellowstone was the world's first National Park:    • Yellowstone - the world's first Natio...  

Learn more here ► https://www.nps.gov/yell/index.htm