Rule Changes and Modern Developments

The game of football has a history of constant rule changes. Rule changes have been implemented to bolster the excitement of the game of football and to increase the game's safety. By 1906 the game was extremely rough, and many injuries and some deaths had occurred. Educators considered dropping the sport despite its popularity on campuses. United States President Theodore Roosevelt, an ardent advocate of strenuous sports, declared that the game must be made safer. As a result, football leaders revamped the game, and many of the rougher tactics were outlawed. In a constant attempt to maintain public interest in the game, NFL rule makers review trends in their sport. For example, in the early 1970s, the rule makers brought the hash marks in closer to the center of the field to give offenses more room to throw wide. The move, which increased scoring and made the game more exciting, also helped bolster the running game. Ten NFL runners gained more than 1000 yards in one season (1972) for the first time in history.

However, the passing game eventually suffered as defenses quickly adjusted. The Pittsburgh Steelers had a stranglehold on the NFL during the 1970s, with four Super Bowl victories. The dominant defensive athletes the Steelers put on the field shut down the wide-open passing attacks that had developed in the previous era. By 1977 scoring was the lowest it had been since 1942, while offensive touchdowns had fallen to their lowest levels since 1938. The rule makers enacted serious measures after this low-scoring 1977 season, fearing a loss of public interest in the defense-dominated game. They established a zone of only five yards from the line of scrimmage in which a bump by a pass defender was permitted. Offensive linemen could extend their arms and open their hands on pass blocks.

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