The Antiquities Act of 1906, officially An Act for the Preservation of American Antiquities (16 USC 431–433), is an act passed by the United States Congress and signed into law by Theodore Roosevelt on June 8, 1906. This law gives the President of the United States the authority to, by executive order, restrict the use of particular public land owned by the federal government. The Act has been used over a hundred times since its passage. Its use occasionally creates significant controversy.
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The Antiquities Act resulted from concerns about protecting mostly prehistoric Indian ruins and artifacts – collectively termed "antiquities" – on federal lands in the West, such as at Chaco Canyon, New Mexico. Removal of artifacts from these lands by private collectors – "pot hunters," in the language of the time – had become a serious problem by the end of the 19th century. In 1902, Iowa Congressman John F. Lacey, who chaired the House Committee on the Public Lands, traveled to the Southwest with the rising anthropologist Edgar Lee Hewett, to see for himself the extent of the pot hunters' impact. His findings, supported by an exhaustive report by Hewett to Congress detailing the archaeological resources of the region, provided the necessary impetus for the passage of the legislation.
The Act was intended to allow the President to set aside certain valuable public natural areas as park and conservation land. The 1906 act stated that it was intended for: "... the protection of objects of historic and scientific interest." These areas are given the title of "National Monuments." It also allows the President to reserve or accept private lands for that purpose. The aim is to protect all historic and prehistoric sites on United States federal lands and to prohibit excavation or destruction of these antiquities. With this act, this can be done much more quickly than going through the Congressional process of creating a National Park. The Act states that areas of the monuments are to be confined to the smallest area compatible with the proper care and management of the objects to be protected.
The United States Supreme Court has repeatedly upheld presidential proclamations under the Antiquities Act, ruling each time that the Act gives the president nearly-unfettered discretion as to the nature of the object to be protected and the size of the area reserved.
Some areas designated as National Monuments have later been converted into National Parks, or incorporated into existing National Parks.
The first use of the Act protected a large geographic feature – President Roosevelt proclaimed Devils Tower National Monument on September 24, 1906. President Roosevelt also used it to create the Grand Canyon National Monument – the first step in protecting that place of great historic and scientific interest. The most recent proclamations were the establishment by President Barack Obama of Fort Ord National Monument in California on April 20, 2012, Chimney Rock National Monument on September 21, 2012,  and Cesar E. Chavez National Monument on October 8, 2012.  President Obama created a further five National Monuments on March 25, 2013, including the First State National Monument in Delaware, the first National Park Service site in that state. 
At 140,000 square miles (360,000 km2), Papahānaumokuākea Marine National Monument is the largest protected area proclaimed. The smallest, Father Millet Cross National Monument, was a mere 0.0074 acres (30 m2).
For any excavation, the Act requires that a permit (Antiquities Permit) be obtained from the Secretary of the department which has jurisdiction over those lands.
Reduction of powers
Presidential powers under the Act have been reduced twice. The first time followed the unpopular proclamation of Jackson Hole National Monument in 1943. The 1950 law that incorporated Jackson Hole into an enlarged Grand Teton National Park also amended the Antiquities Act, requiring Congressional consent for any future creation or enlargement of National Monuments in Wyoming. The second time followed Jimmy Carter's use of the Act to create fifty-six million acres (230,000 km²) of National Monuments in Alaska. The Alaska National Interest Lands Conservation Act requires Congressional ratification of the use of the Antiquities Act in Alaska for withdrawals of greater than 5,000 acres (20.2 km²).
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- Cameron v. United States, 252 U.S. 450
- Cappaert v. United States, 426 U.S. 128
- President of the United States of America (September 21, 2012). "Establishment of the Chimney Rock National Monument" (pdf). The White House. Retrieved September 21, 2012.
- President of the United States of America (October 1, 2012). "President Obama to Establish César E. Chavez National Monument". The White House. Retrieved October 8, 2012.
- Andrew Mach (March 25, 2013). "To protect lands, Obama designates five new national monuments". NBC News. Retrieved March 25, 2013.
- Papahānaumokuākea protects submerged land. The largest surface reservation was the proclamation of Wrangell-St. Elias National Monument, 10,950,000 acres (40,000 km2).
- Antiquites Act: Monument List. National Park Service Archeology Program. Archived from the original on 9 May 2009. Retrieved 2009 May 20 .
- Robert W. Righter. "National Monuments to National Parks: The Use of the Antiquities Act of 1906". Archived from the original on 27 May 2006. Retrieved May 16, 2006.
- U.S. Fish and Wildlife Service. "Digest of Federal Resource Laws of Interest to the U.S. Fish and Wildlife Service: Alaska National Interest Lands Conservation Act of 1980". Archived from the original on 26 June 2006. Retrieved May 16, 2006.
- Richard West Sellars, "A Very Large Array: Early Federal Historic Preservation--The Antiquities Act, Mesa Verde, and the National Park Service Act"(background and legislative history) published by the University of New Mexico School of Law, 2007.
- The Story of the Antiquities Act, by Ronald F. Lee
- Antiquities Act 1906–2006
- The National Park Service
- Almanac of Theodore Roosevelt
- The Antiquities Act: A Century of American Archaeology, Historic Preservation, and Nature Conservation, ed. by David Harmon, Frank P. McManamon, and Dwight T. Pitcaithley
- The Highs and Lows of the Antiquities Act