Also, the script should alternate action, drama and romance from scene to scene throughout the screenplay. The war years produced many films, that utillized Symbolism, allegories and parables.
The most prominent persons of film such as Charlie Chaplin, Mary Pickford and D.W. Griffith realized their own value joined together in 1919 to form their own company, United Artists. The major American production, distribution and exhibition companies as they are known today were all consolidated by the mid-1920s, with Metro-Goldwyn-Mayer (MGM), Warner Bros., Columbia, and Fox joining Universal, Paramount and United Artists, which had been formed several years before. The most popular comedian in 1920s was Harold Lloyd. He played a realistic character in films such as Safety Last (1923).
Sound film started in Western Europe a couple of years later than in the United States, and even later in other countries. It was about year 1927, when Al Johnson spoke a few lines in The Jazz Singer. This had an immense succes at audience, and therefore was started making of sound films. The major technical development of the period was the first realization of a successful system of full-colour cinematography – Technicolor. This was used in live action filming from 1934, but mainly only in very special productions such as The Wizzard of Oz and Gone With the Wind because of its cost.
During and after World War II, there was a greater tendency to deal with unpleasant side of life. In following years were shooting films, which included also a new themes such as war, prostitution, homosexuality, juvenile delinquency, etc. and were also longer than before. Here are some of them: A Street Car Named Desire (1951), Cat on a Hot Tin Roof (1958), Rebel Without a Cause (1955), Citizen Kane(1941)...
In 1960s appeared innovations which picked up New Wave of directors, who shot films like You`re a Big Boy Now (1967) or Greetings (1968) by Brian De Palma.
1970s brought new trend in the Hollywood production. Films were extremly expensive, big-budget, all-action pictures and many of them were on science-fiction subjects. This trend was partly begun by George Lucas with Star Wars (1977), but the most commercially successful film-maker in this area is Steven Spielberg.