Jose Rangel Chavez and 18 other Mexican guest workers were dozing as their bus hurtled down Interstate 40 in a light rain. After nine months away from home, the 22-year-old was about to complete a meandering round trip of nearly 5,000 miles.

They were just north of Little Rock, Arkansas, about a half day’s hard ride from the border, when the motor coach struck a concrete bridge support, peeling back the roof like a sardine can. Chavez and five others were killed; seven more workers were severely injured.