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BIG BEND NATIONAL PARK, TEXAS- MARCH 15: A road runner stands near the Rio Grande at the U.S.-Mexico border on March 15, 2024 in Big Bend National Park, Texas. Located in the Chihuahuan Desert in West Texas, the park is one of the largest and most remote in the contiguous United States. Visited by some 370,000 tourists annually, it is also considered one of the most beautiful stretches of the U.S. southwestern border with Mexico. The border between the two nations stretches nearly 2,000 miles, from the Gulf of Mexico to the Pacific Ocean and is marked by fences, deserts, mountains and the Rio Grande, which runs the entire length of Texas. The politics and controversies surrounding border and immigration issues have become dominant themes in the U.S. presidential election campaign. (Footage by John Moore/Getty Images)