“If future generations are to remember us with gratitude rather than contempt, we must leave them … a glimpse of the world as it was in the beginning, not just after we got through with it…once man can no longer walk with beauty or wonder at nature, his spirit will wither and his sustenance be wasted.”
~ Lyndon B. Johnson, President of the United States”

Wyoming

Yellowstone was the first national park in the US, and is also widely understood to be the first national park in the world. It was established by the 42nd Congress through the Yellowstone National Park Protection Act and signed into law by President Ulysses S. Grant on March 1, 1872.

National Park Service, first 100 Years
Yellowstone National Park, Wyoming
Established March 1, 1872