Cinema

Scientific Outlook (1931) by Bertrand Russell, page 199:

But perhaps the most important of all the modern agents of propaganda is the cinema. Where the cinema is concerned, the technical reasons for large-scale organizations leading to almost world-wide uniformity are overwhelming. The costs of a good production are colossal, but are no less if it is exhibited seldom than if it is exhibited often and everywhere. The Germans and the Russians have their own productions, and those of the Russians are, of course, an important part of the Soviet government's propaganda. In the rest of the civilized world the products of Hollywood perponderate. The great majority of young people in almost all civilized countries derive their ideas of love, of honour, of the way to make money, and of the importance of good clothes, from the evenings spent in seeing what Hollywood thinks good for them.

In the American imperialism of the future it may turn out that the producers of cinemas have been the pioneers (201)