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Since the 1960s, all regular season and playoff games broadcast in the United States have been aired by national television networks. When the rival American Football League (AFL) began in 1960, it signed a 5-year television contract with ABC. This became the first ever cooperative television plan for professional football, through which the proceeds of the contract were divided equally among member clubs. ABC and the AFL also introduced moving, on-field cameras (as opposed to the fixed midfield cameras of CBS and the NFL), and were the first to have players "miked" during broadcast games. As the AFL also had players' names stitched on their jerseys, it was easier for both TV viewers and people at the games to tell who was who.
As of the 1961 season, CBS held the rights to all but one of the NFL's teams; the Cleveland Browns had a separate contract with Sports Network Incorporated (SNI) to carry their games over a regional network. However, the Browns and SNI were forced to break their deal when the NFL and CBS devised their own revenue sharing plan after CBS agreed to telecast all regular season games for an annual fee of $4.65 million. A special antitrust exemption, the Sports Broadcasting Act of 1961, was passed in Congress to accommodate the collective contract, which restricted what days the league could televise their games. CBS' fee later increased to $14.1 million per year in 1964, and $18.8 million per year in 1966.
With NBC paying the AFL $36 million in 1965 to televise its games, and the intensified battle over college prospects, both leagues negotiated a merger agreement on June 8, 1966. Although they would not officially merge into one combined league until 1970, one of the conditions of the agreement was that the winners of each league's championship game would meet in a contest to determine the "world champion of football."
The first ever AFL-NFL World Championship Game was played on January 15, 1967, between the NFL champion Packers and the AFL champion Chiefs. As CBS held the rights to nationally televise NFL games and NBC had the rights to broadcast AFL matches, it was decided that both would cover that first game. The next three AFL-NFL World Championship Games, the initial Super Bowls, were then divided by the two networks: CBS broadcast Super Bowls II and IV while NBC covered III.