Established by Presidential Proclamation No. 2193 on August 10, 1936 (50 Stat. 1760) as Joshua Tree National Monument. Legislation states that the "lands contain historic and prehistoric structures and have situated thereon various objects of historic and scientific interest…" (50 Stat. 1760). … the legislative history reveals that another major reason for the establishment of the monument was preservation of the natural resources of the Colorado and Mojave Deserts. The natural resource preservation emphasis was so strong that the original name contemplated for the monument was Desert Plants National Park.