What legislation, passed in 1906, allows the president to designate national monuments on federal lands for scientific or historical purposes?

The legislation that allows the president to designate national monuments on federal lands for scientific or historical purposes is the Antiquities Act, passed in 1906. This act was significant because it provided a means to protect significant natural, cultural, and scientific resources in the United States by allowing the President to create national monuments without the need for congressional approval. The Antiquities Act aimed to preserve landmarks, structures, and other objects of historic or scientific interest, thereby establishing a foundation for future conservation efforts and protecting areas that might otherwise be threatened by development or exploitation. This act has been used by various presidents throughout history to designate numerous national monuments, reflecting its importance in the realm of federal land management and conservation policies.