KINNEY COUNTY, Texas—Living on a ranch in the middle of nowhere is the epitome of the American dream for many Texans. They keep to themselves, help their neighbors, and work hard. But in the past few months, ranchers have been getting unwelcome visitors who destroy their property, steal their vehicles, and scare their families. They’re the illegal immigrants, usually adult males who have evaded Border Patrol and are heading to a large city where it’s easier to disappear. Cole Hill, his wife, and their three children, ages 9, 7, and 5, live on a ranch in Kinney County, about 35 miles north of the U.S.–Mexico border. The property also flanks a Border Patrol highway checkpoint, and those who want to evade capture tend to walk a wide berth around it. Hill said he’s dealt with illegal aliens traversing his land for years, but only around 25 people a year, on …