Big Three (American television)

From the 1950s to the 1980s, during the network era of American television, there were three commercial broadcast television networks – NBC (the National Broadcasting Company, "the Peacock Network"), CBS (the Columbia Broadcasting System, "the Eye Network"), ABC (the American Broadcasting Company, "the Alphabet Network") – that due to their longevity and ratings success are informally referred to as the "Big Three". The three networks' dominance was interrupted with the launch of Fox (the Fox Broadcasting Company, "the Searchlight Network") in 1986, leading it to join them as one of the expanded "Big Four", while the viewership shares of all the major broadcast networks declined over the following years.

Backgrounds

The National Broadcasting Company and Columbia Broadcasting System were both founded as radio networks in the 1920s, with NBC eventually encompassing two national radio networks, the prestige Red Network and the lower-profile Blue Network. They gradually began experimental television stations in the 1930s, with commercial broadcasts being allowed by the Federal Communications Commission on July 1, 1941. In 1943, the U.S. government determined that NBC's two-network setup was anticompetitive and forced it to spin off one of the networks; NBC chose to sell the Blue Network operations, which eventually became the American Broadcasting Company.

All three networks began regular, commercial television broadcasts in the 1940s. NBC and CBS began commercial operations in 1941, followed by ABC in 1948. A smaller fourth network, the DuMont Television Network, launched in 1944. The three networks originally controlled only a few local television stations, but they quickly affiliated with other stations to cover almost the entire U.S. by the late 1950s. Several of these stations affiliated with all three major networks and DuMont, or some combination of the four, in markets where only one or two television stations operated in the early years of commercial television; this resulted in several network shows, often those with lower national viewership, receiving scattershot market clearances, since in addition to maintaining limited broadcast schedules early on, affiliates that shoehorned programming from many networks had to also make room for locally produced content.