BALTIMORE (Reuters) -They came to the United States for a chance at a better life. The six victims of the Francis Scott Key Bridge collapse were all immigrants from Mexico and Central America, doing the kind of grueling work that many immigrants take on, when a container ship crashed into a support pillar at 1:30 a.m. EDT on Tuesday (0530 GMT) and sent them plunging into the icy Patapsco River. Divers pulled the bodies of Alejandro Hernandez Fuentes and Dorlian Castillo from a red pickup truck 2