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In 1919. It had previously been a game preserve and a National Monument. Each of those designations was used to preserve the area for viewing by future generations.

The Grand Portage National Monument was created to help people "established by congress in 1958 to preserve and interpret fur trade and Ojibwe history and culture."

5. City of Rocks National Reserve (SE Idaho), Craters of the Moon National Monument (SE Idaho), Hagerman Fossil Beds National Monument (SC Idaho), Minidoka Internment National Monument (SC Idaho), and Nez Perce National Historical Park (N Idaho).

"...On May 30, 1910, President William Howard Taft created Rainbow Bridge National Monument to preserve this 'extraordinary natural bridge, having an arch which is in form and appearance much like a rainbow, and which is of great scientific interest as an example of eccentric stream erosion.'"