- The documentary genre began with early films from the Lumiere brothers that simply filmed real life events like workers leaving a factory.
- Robert Flaherty's 1922 film Nanook of the North is considered the first feature-length documentary as it used conventions like narration and archive footage.
- In 1926, John Grierson coined the term "documentary" in a film review, helping to define the emerging genre.
- In the 1960s, the cinéma vérité style used lightweight, handheld cameras and sync sound to try to more realistically capture documentary subjects.
- Documentaries increasingly embraced an activist approach to raise awareness about issues like civil rights, the anti-war movement, and women