Lone Star (John Sayles, USA, 1996). A skeleton discovered on an Army base in a Texas border town triggers a historical investigation that traces the transformation of the community over one generation. The white sheriff (Chris Cooper), fighting an Oedipal shadow, suspects his sheriff father of murder. Navigating through Anglo, black and Mexican worlds to solve the enigma of the skeleton, the sheriff discovers that the boundaries of the past were more unstable than he had thought. Made shortly after the passage of the North American Free Trade Agreement (1994), the film shows how immigration from Mexico inevitably threatens the corrupt grip of the white power structure at both the professional and personal level.