Sieur de Monts National Monument: July 8, 1916
Lafayette National Park: February 26, 1919
Acadia National Park: January 19, 1929
Official Site: https://www.nps.gov/acad/index.htm
Wikipedia: https://en.wikipedia.org/wiki/Acadia_National_Park
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From Wikipedia:
The park preserves about half of Mount Desert Island, part of the Isle au Haut, the tip of the Schoodic Peninsula, and portions of 16 smaller outlying islands. It protects the natural beauty of the rocky headlands, including the highest mountains along the Atlantic coast. Acadia boasts a glaciated coastal and island landscape, an abundance of habitats, a high level of biodiversity, clean air and water, and a rich cultural heritage.
The park contains the tallest mountain on the Atlantic Coast of the United States (Cadillac Mountain), exposed granite domes, glacial erratics, U-shaped valleys, and cobble beaches. Its mountains, lakes, streams, wetlands, forests, meadows, and coastlines contribute to a diversity of plants and animals. Weaved into this landscape is a historic carriage road system financed by John D. Rockefeller Jr.
Many conservation-minded citizens, among them George B. Dorr (the "Father of Acadia National Park"), worked to establish this first national park east of the Mississippi River and the only one in the Northeastern United States. Acadia was initially designated Sieur de Monts National Monument by proclamation of President Woodrow Wilson in 1916, then renamed and redesignated Lafayette National Park in 1919. The park was renamed Acadia National Park in 1929.