The Yellowstone Park Act Approved March 1, 1872 Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That the tract of land in the Territories of Montana and Wyoming, lying near the headwaters of the Yellowstone river . . . is hereby reserved and withdrawn from settlement, occupancy, or sale under the laws of the United States, and dedicated and set apart as a public park or pleasuring-ground for the benefit and enjoyment of the people. The Yellowstone Story traces the history of the Yellowstone region from the time when hunters and gatherers migrated into the Rocky Mountains thousands of years ago to the post-World War II era when tourists began inundating Yellowstone National Park. Volume I takes the account from prehistoric times through the mid-1880s, with emphasis on the park's exploration and its trouble-filled early years under federal management. Volume II covers the years of military administration of the park and the more recent developments under the National Park Service.