The merger of the National Football League (NFL) and the American Football League (AFL) led to Paul Brown bringing his Cincinnati Bengals expansion team to Cleveland in Week 4 of the 1970 season to play the Cleveland Browns.
When I was growing up in Berea, Ohio, I was too young to remember the incredible Browns teams of the 1940s and 1950s. But I read about how head coach Paul Brown started the team in the All-American Football Conference and won all four championships that the league ever had. Then the team came to the NFL and continued to win championships.