Briefly describe one specific historical similarity between mass media in the 1920s and in the 1950s

Both dates occurred after two world wars, the 1920s preceded the World War 1 while the 1950s preceded World War 2.

The mass media similarity between these two is that it focused more on entertainment and advertisements. Because the war ceased already, films and entertainment shows flourished greatly. 

The coast of north america , basically yes newfoundland , i would say c , good luck