NFL at 100 Expansion Football

In this Oct. 16, 1960, file photo, Cleveland Browns’ Ray Renfro (26), left, catches a pass before being tackled by Dallas Cowboys’ Tom Franckhauser (32), right, during the first half of a football game at the Cotton Bowl in Dallas. George Halas wanted an NFL team in Dallas, and in 1960 the influential founder of the Chicago Bears helped Clint Murchison get one.

George Halas wanted an NFL team in Dallas, and in 1960 the influential founder of the Chicago Bears helped Clint Murchison get one.

Less than 10 years later, a league that for decades piggybacked geographically on baseball went from 16 to 26 franchises in a merger with the rival American Football League, making plans to get even bigger on its way to replacing America’s pastime as the country’s favorite sport.