1951 – The ineligible receiver rule in the NFL (Tackles, centers, and guards cannot receive a forward pass), and the first coast-to-coast telecast of a championship game. The Rams beat the Browns 24-17.
1952 – The Pittsburgh Steelers became the last team to switch from the single-wing to the T formation.
1958 – Two points could be scored on points after touchdown in college football.
1959 – Formation of the American Football League by Lamar Hunt.