Rancher Jim Chilton opens a gate near the U.S.-Mexico border outside Arivaca. His ranchland extends 5 miles along the border, which is marked by a waist-high fence of four strands of barbed wire.

Rancher Jim Chilton opens a gate near the U.S.-Mexico border outside Arivaca. His ranchland extends 5 miles along the border, which is marked by a waist-high fence of four strands of barbed wire.