Are you looking for historical videos to use for a media project? Make sure you visit the Prelinger Archives (and the many other collections) at Archive.org.
The Prelinger Archives in particular have an eclectic collection of home movies, advertising, and quirky educational films, including the Coronet Instructional Films that were shown in many American schools. These videos are free of all usage restrictions and that means you can include clips from these films in your own digital media projects. (Looking for copyright-free photos? Read this article).
The next time you need to find historical video for your personal projects, start at Archive.org.