list of films inducted into the US National Film Registry:
http://en.wikipedia.org/wiki/National_Film_Registry
The National Film Registry is the registry of films selected by the United States National Film Preservation Board for preservation in the Library of Congress. The board, established by the National Film Preservation Act of 1988, was reauthorized in 1992, 1996, and 2005 by acts of Congress. The 1996 law also created the non-profit National Film Preservation Foundation, which is affiliated with the National Film Preservation Board but which raises money from the private sector.
The National Film Registry is meant to preserve up to twenty-five "culturally, historically, or aesthetically significant films" each year; to be eligible, films must be at least ten years old. The films do not have to be feature-length or to have had a theatrical release. The National Film Registry is meant to showcase the full range and diversity of American film heritage, and includes films ranging from Hollywood classics to so-called orphan films -- newsreels, silent films, experimental films, films out of copyright protection, significant amateur footage, documentary films, independent films, home movies and even TV movies. As of 2008, there were 500 films preserved in the National Film Registry.
The most recent film is Fargo (1996), while the oldest film is Blacksmith Scene (1893). The most represented year in the list is 1939 which has nineteen entries.