a) Ulysses S. Grant

Ulysses S. Grant’s presidency saw the establishment of Yellowstone as the first national park in 1872. This significant conservation effort marked the beginning of a global national park movement. Grant’s signing of the Yellowstone National Park Protection Act preserved over two million acres of land, recognizing the intrinsic value of its unique geysers, hot springs, and ecological diversity. This visionary move was a significant stride in environmental conservation, showing a commitment to protecting natural treasures for future generations and setting a precedent for environmental stewardship.