How to read it
The timeline is a spine, not a full encyclopedia. Each point is a durable reference that can support team, people, stats, or glossary pages.
League chronology
NFL League Timeline
Move your mouse across the rail, or click a year, to follow the league's durable historical anchors from the 1920 organization meeting to the replay era.
Merger marker
1966 and 1970 are kept separate because agreement and league structure are different historical steps.
Operations marker
1986 marks replay as an operations concept, useful when glossary pages explain officiating and review procedures.