U.S. National Monuments
As of September 2015, there are 117 National Monuments in the United States. Monuments can be established either by Congress through legislation or by the President through the Antiquities Act. The first national monument was Devils Tower in Wyoming, established by Theodore Roosevelt in 1906. Thirty of the 50 states have national monuments, as do D.C., the Virgin Islands, American Samoa, the Minor Outlying Islands and the Northern Mariana Islands; Arizona, with 18, has the most national monuments of any state.
avg. score: 10 of 117 (8%)
required scores: 1, 2, 5, 8, 15