World’s first national park, Yellowstone National Park in the United States, was established.

The Yellowstone National Park Protection Act was a law passed by the 42nd US Congress and signed into law by President Ulysses S.

US President Ulysses S Grant on March 1st, 1872, establishing Yellowstone National Park.

Yellowstone was the first national park in the US and is considered to be the first national park in the world.