In the United States, for most of the history of broadcasting, there were only three or four major commercial national broadcast networks. From 1946 to 1956, these were ABC, CBS, NBC and DuMont. From 1956 to 1986, the "Big Three" national commercial networks were ABC, CBS, and NBC. From 1954 to 1970, National Educational Television was the national clearinghouse for public TV programming; the Public Broadcasting Service succeeded it in 1970.
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