Yellowstone National Park was signed into law by President Ulysses S. Grant.

President Ulysses S. Grant signed the law to establish Yellowstone National Park as the world's first national park on March 1, 1872.

Ulysses S. Grant (US President from Mar 4, 1869 - Mar 4, 1877) established Yellowstone as the world's first national park on March 1, 1872. The area of Yellowstone is located mostly in the state of Wyoming, but also stretches into parts Montana and Idaho.

Yellowstone was the first national park. If you were wondering, it was founded in 1872 and was signed into law by president Ulysses S. Grant.

President's Park was created on 1790-07-16.