Big Three Television Networks

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The Big Three Television Networks are the three traditional broadcast (over the air) TV networks in the United States: ABC, CBS and NBC.

NBC and CBS were founded as radio networks in the 1920's. They gradually began experimental television stations in the 1940's. ABC was spun off from NBC in 1943 when the U.S government found evidence indicating NBC was operating a monopoly.

The three companies began regular television broadcasts in 1946. The three networks originally only controlled a few local television stations, but swiftly expanded their networks of stations to cover the entire United States.

For most of U.S. television history, the Big Three dominated U.S. television, controlling up to 99% of television broadcasting. There were attempts by other companies to enter the television medium, but few of these start-ups lasted very long. The prohibitive cost of starting a broadcast network, coupled with active sabotage by the Big Three Networks (particularly NBC and CBS), led to the downfall of almost all new companies. A viable "fourth network" would not become competitive with the Big Three until the Fox Network was founded in 1986.

Today, the "Big Three" control only a (relatively) small portion of the market. With broadcast competitors such as Fox, The WB, and UPN, satellite and cable companies, the Big Three's market share has dwindled considerably.

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