D. W. Griffith - What Drink Did 1909

Many of the early two-reelers -- 10-15 minutes each -- told a simple story derived from the stock situations of 19th-century stage melodrama, with an obvious moral lesson.
They were also often intended to encourage the "improvement" of the lower classes who attended cinemas in large number. The temperance movement that eventually led to Prohibition was stimulated by films like this one, and Women's Suffrage was helped along by images of intelligent, determined women in the movies