The first National Park Week was established by Congress in 1991, in recognition of the 75th anniversary of NPS.
“The founding of our magnificent Yellowstone National Park in 1872 not only marked an important milestone in the history of American conservationism but also inspired a worldwide movement to set aside certain lands for the preservation of their unique scenic value and natural resources,” President George H.W. Bush said in a proclamation observing the week. “[In 1991] more than 100 countries boast some 1,200 national parks or equivalent preserves.”
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