Grand Teton National Park: February 26, 1929
Jackson Hole National Monument: 1943
Monument Abolished / Incorporated into National Park: September 14, 1950
Official Site: https://www.nps.gov/grte/index.htm
Wikipedia - Grand Teton National Park: https://en.wikipedia.org/wiki/Grand_Teton_National_Park
Wikipedia - Jackson Hole National Monument: https://en.wikipedia.org/wiki/Jackson_Hole_National_Monument
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Efforts to preserve the region as a national park began in the late 19th century, and in 1929 Grand Teton National Park was established, protecting the Teton Range's major peaks. The valley of Jackson Hole remained in private ownership until the 1930s, when conservationists led by John D. Rockefeller, Jr. began purchasing land in Jackson Hole to be added to the existing national park. Against public opinion and with repeated Congressional efforts to repeal the measures, much of Jackson Hole was set aside for protection as Jackson Hole National Monument in 1943. The monument was abolished in 1950 and most of the monument land was added to Grand Teton National Park.