This bill proposes to amend title 54, United States Code , to significantly restrict the process for designating national monuments within Arizona. Its primary purpose is to prohibit the extension or establishment of national monuments in Arizona unless expressly authorized by an act of Congress. The legislation achieves this by modifying section 320301(d) of title 54, inserting "or Arizona" alongside existing language that applies to Wyoming. This amendment would effectively remove the President's ability to unilaterally create or expand national monuments in Arizona through proclamation under the Antiquities Act. Consequently, any future national monument designations or expansions in Arizona would require direct legislative approval from Congress.