MEXICO CITY - Ten-year-old Adriana Salgado spends her days in a field in northwestern Mexico, picking the spinach, cabbage and other vegetables that fill American salad bowls. Adriana doesn't know how to read. She attends school for only one hour a day.
Her 15-year-old sister, who works with her, can't read, either. Adriana had an 8-year-old brother, too, until he was crushed to death by a tractor while working in a tomato field last year.