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51 years ago today that the NFL-AFL merger took form when the Baltimore Colts, Cleveland Browns and Pittsburgh Steelers of the 16-team NFL agreed to join the AFL to form the 13-team American Football Conference. It was also the same day in which the new NFL agreed on a playoff format that introduced some crazy concept of a wild-card entrant from each conference.
The following 1970 season, the two leagues would operate under the NFL shield and its commissioner, Pete Rozelle. The league would be divided into two 13-team conferences with three divisions isn each conference.