Electronic television developed during the 1930s. After World War II it quickly grew in popularity and replaced radio as the main information and entertainment medium.
Three networks—NBC, CBS, and ABC—dominated early TV. Live drama, variety, and quiz and game shows were popular during the 1950s.
Television matured in the 1960s, and its content became more professional. The public television network began in 1967. Cable TV grew slowly during this decade.
The 1970s saw TV programs criticized for excessive violence.
