The Racine Cardinals are created. Today they are known as the Arizona Cardinals.
The APFA (American Professional Football Association) was created on August 20, 1920.
The Rock Island Independents beat the St. Paul Ideals 48-0.
The APFA changes its name to the NFL (National Football League).
The first NFL playoff game was played.
The NFL televised their first game.
The NFL merged with the rival league AFL (American Football League).
One of the coldest NFL games in history.
The first Super Bowl is played.
The "Heidi" game is played. Only the people at the stadium saw the end of the game.
The NFL and AFL changed their names to NFC and AFC (National and American Football Conference).
The "Immaculate reception" was made by the former Pittsburgh Steeler, Franco Harris.
The Buffalo Bills complete the greatest comeback in NFL history beating the Houston Oilers 41-38.
The NFLN (NFL Network) was created.
Super Bowl LI (51) was the first Super Bowl to go into overtime.