No, the park was created from lands that were previously a forest preserve.
The Great Northern Railway could probably be cited as the biggest reason in creating the park. After placing a rail line over the Continental Divide (Marias Pass) in 1891, the company lobbied Congress to set the land aside for protection while also publicly promoting their railroad's new route. In 1897 Congress set it aside as a Forest Preserve. The railroad (and George Grinnell from the Boone and Crockett Club) lobbied for further protections, with President Taft declaring it a National Park in 1910.
While private philanthropy has aided in the parks improvement, it was the Organic Act signed by President Woodrow Wilson in 1912 that created National parks in the United States.
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