FILE - In this Nov. 21, 1996, file photo, tourists cast their shadows on the ancient Anasazi ruins of Chaco Culture National Historical Park in New Mexico. Lawmakers from the country's largest American Indian reservation may have thrown a wrinkle into efforts aimed at establishing a permanent buffer around the national park as New Mexico's congressional delegation, environmentalists and other tribes try to keep oil and gas development from getting closer to the World Heritage site. Navajo Nation delegates voted Thursday, Jan. 23, 2020, to support a buffer only half the size of the one proposed in legislation pending in Congress. (AP Photo/Eric Draper, File)
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