In the United States, national monuments are primarily established by the President using the authority granted by the Antiquities Act of 1906. This law allows the President to protect "historic landmarks, historic and prehistoric structures, and other objects of historic or scientific interest" on federal land by proclamation. While Congress also has the power to create national monuments through legislation, the presidential route is much faster and more common; since Theodore Roosevelt first used it for Devils Tower, nearly every president has utilized this power. In 2026, these designations remain a key tool for conservation, allowing for the immediate protection of large landscapes or cultural sites (like the Emmett Till and Mamie Till-Mobley National Monument) without the lengthy political debates required for a full "National Park" designation.