was so designated 75 years ago yesterday (February 26, 1929).
The photo and the following history are from the Grand Teton National Park web site.
The original Grand Teton National Park, set aside by an act of Congress in 1929, included only the Teton Range and six glacial lakes at the base of the mountains.
The Jackson Hole National Monument, decreed by Franklin Delano Roosevelt through presidential proclamation in 1943, combined Teton National Forest acreage, other federal properties including Jackson Lake and a generous 35,000-acre donation by John D. Rockefeller, Jr. The Rockefeller lands continued to be privately held until December 16, 1949 when impasse for addition to the national park was resolved.
On September 14, 1950, the original 1929 Park and the 1943 National Monument (including Rockefeller’s donation) were united into a “New” Grand Teton National Park, creating present-day boundaries.