In 1970, the AFL was absorbed into the NFL and the league reorganized with the ten AFL franchises along with three existing NFL teams: the Baltimore Colts, the Cleveland Browns, and the Pittsburgh Steelers, becoming part of the newly formed American Football Conference.
The AFL and the NFL champions faced each other in Super Bowl IV at the end of the season to determine an overall champion.
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I sincerely appreciate the research work, and the information being shared. It is important and interesting history.