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President Obama will create the largest national monument of his tenure on Wednesday, making nearly 500,000 acres of southern New Mexico off limits to development. The Organ Mountains-Desert Peaks region has petroglyphs from three Native American societies in its canyons, as well as desert grasslands and a petrified forest. The area is twice as big as the Rio Grande del Norte National Monument in New Mexico, which previously held the ranking as Obama’s largest. Many community leaders had pressed the president to protect the region under the Antiquities Act rather than waiting for Congress to make a move. But some in the area near Las Cruces, including cattle ranchers and Republican lawmakers, oppose a presidential designation, saying it is too far-reaching and will not provide enough safeguards for border officers. More