As families of the more than 60 people packed into a tractor-trailer and abandoned on Monday in Texas began to confirm their worst fears and talk of their relatives, a common narrative of pursuing a better life took shape from Honduras to Mexico. Fifty-three of those migrants left in the sweltering heat on the outskirts of San Antonio had died as of Wednesday, while others remained hospitalized. The tedious process of identifications continues, but families are confirming their losses. The dead included 27 people from Mexico, 14 from Honduras, seven from Guatemala and two from El Salvador, said Francisco Garduño, chief of Mexico's National Immigration Institute. Each put their lives in the hands of smugglers. News of the trailer full of bodies struck horror in cities and villages accustomed to watching their young people leave, trying to flee poverty or violence in Central America and Mexico.