![8203747657_5347142e8e_o](https://hoolauna.wordpress.com/wp-content/uploads/2013/10/8203747657_5347142e8e_o.jpg?w=780&h=520)
1920: American Professional Football Association formed and was renamed the National Football League in 1922.
1934: An NFL game was broadcast nationwide for the first time.
1935: The first Heisman Trophy was awarded to Jay Berwanger.
1939: Riddell made the first plastic helmet.
1943: All NFL players are required to wear helmets.
1962: All NFL players wore face masks.
1967: The Green Bay Packers defeated the Kansas City Chiefs in the first Super Bowl.
1970: The Super Bowl trophy was renamed the Vince Lombardi trophy.
1980: Rules regarding contact with the head, neck and face become stricter.
1994: The Mild Traumatic Brain Injury committee was created to study the effects of concussions in NFL players.
2002: Evidence of chronic traumatic encephalopathy is found in the brain of former NFL player Mike Webster.
2010: The NFL implements harsher penalties for players who target another player’s head when tackling.
2013:The NFL settled a lawsuit with former players for $765 million.