Grand Canyon National Monument is created.

The history of the Grand Canyon National Monument is closely tied to the growing conservation movement in the United States during the late 19th and early 20th centuries. Long before federal protection, the canyon was home to Indigenous peoples such as the Ancestral Puebloans, Hopi, Havasupai, and Hualapai, who lived in and around the region for centuries. European American interest increased after expeditions led by John Wesley Powell in the 1860s and 1870s, which brought national attention to the canyon’s immense scale, geology, and scientific value.

As mining, tourism, and railroad expansion accelerated in the late 1800s, concerns grew that the Grand Canyon could be irreversibly damaged by private development. Early preservation efforts were championed by naturalists and politicians, most notably President Theodore Roosevelt, who visited the canyon in 1903 and urged Americans to protect it. In 1908, Roosevelt used the Antiquities Act to proclaim the Grand Canyon a national monument, a move that immediately restricted mining and large-scale exploitation while preserving the landscape for public benefit.

The designation as a national monument laid the groundwork for even stronger protection. Although mining interests challenged the proclamation in court, the U.S. Supreme Court ultimately upheld the federal government’s authority to protect the area. This legal victory reinforced the power of the Antiquities Act and set a major precedent for conservation nationwide. In 1919, the monument was redesignated as Grand Canyon National Park, solidifying its status as one of the most protected and celebrated natural landscapes in the United States.