Which national park in Wyoming is the world's first national park?

The national park in Wyoming known as the world’s first national park is Yellowstone National Park. The United States established it on March 1, 1872, when President Ulysses S. Grant signed the Yellowstone National Park Protection Act.

Yellowstone was created to preserve its spectacular landscapes, wildlife, and geothermal features for public enjoyment rather than private development. It is centered on a huge volcanic system and contains geysers, hot springs, mud pots, and fumaroles. Old Faithful is its best-known geyser, although it is only one part of the park’s much larger geothermal network.

Yellowstone lies mainly in northwestern Wyoming, but parts extend into Montana and Idaho. Native peoples have lived in and traveled through the region for at least 11,000 years, so describing the park as untouched wilderness overlooks its long human history. Yellowstone is commonly called the first national park in the world, although the exact definition of “national park” can vary by country and historical interpretation.