The Rio Grande forms an elbow known as the Big Bend as it flows southward from El Paso, Texas, defining the U.S.-Mexico border. As seen at Big Bend State Park, mountains form a natural barrier. Residents on both sides say they are glad not to be separated a border fence. Rusty Hill (left) owns a store in La Ruidosa, Texas. (Associated Press)

The Rio Grande forms an elbow known as the Big Bend as it flows southward from El Paso, Texas, defining the U.S.-Mexico border. As seen at Big Bend State Park, mountains form a natural barrier. Residents on both sides say they are glad not to be separated a border fence. Rusty Hill (left) owns a store in La Ruidosa, Texas. (Associated Press)