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BARBARA KLEIN:

Many experts say station KDKA in Pittsburgh, Pennsylvania was the first American radio station. It broadcast results of the American presidential election in November, nineteen twenty. That is generally considered the start of professional radio broadcasting in the United States.

Soon, radio stations began to appear in other areas. In nineteen twenty-two, two stations in New York State joined together to broadcast the championship game of American baseball. The stations were connected by telephone lines. This permitted them to share the same program. It was one of the first examples of a radio network.

STEVE EMBER:

By the middle of the nineteen-twenties, there were two main radio networks in the United States. The National Broadcasting Corporation, NBC, was formed by the Radio Corporation of America. NBC became the first permanent national network. The other network was the Columbia Broadcasting System, called CBS. The networks provided programs to radio stations across the country. Local stations created very few programs. What listeners heard in New York was often heard in Los Angeles, California and other cities.

BARBARA KLEIN:

David Sarnoff was the man responsible for NBC. As a young man, Sarnoff had taught himself Morse code. He got a job with the Marconi Wireless Telegraph Company where he worked as a telegraph operator. He was on duty when the passenger ship Titanic sank in the Atlantic Ocean in nineteen twelve. Sarnoff helped the rescue effort by informing other ships about the accident. He understood that someone using radio could affect many lives. By nineteen twenty-one, Sarnoff was an official of the Radio Corporation of America. He pushed RCA to enter broadcasting. The company soon earned huge profits. Five years later, David Sarnoff helped create NBC. David Sarnoff developed the theory of broadcasting.