Hollywood was revolutionized in the 1930s. No decade saw more change in both the industry and the films it produced. At the start of the decade, Hollywood was still feeling the economic effects of the Crash and had not yet solved the problems created by the transition to talking pictures. The industry was also still negotiating content standards that would appease critics in the American heartland, but yet allow for the kind of movies that would sell in the big cities. By the end of the decade, the studio system had weathered the Depression, the Production Code, and labour action and unionization, Now expert at the spectacular use of colour and sound, the industry had become a well-oiled, vertically-integrated, industrial powerhouse. And Hollywood had established itself as an American icon. "American Cinema of the 1930s" analyses sixty diverse films of the decade, including "Dracula", "The Public Enemy", "Trouble in Paradise", "42nd Street", "King Kong", "Imitation of Life", "Captain Blood", "Swing Time", "A Star Is Born", "Nothing Sacred", "Jezebel", "The Wizard of Oz", and "Gone with the Wind".