High Quality Content by WIKIPEDIA articles! The 1976 NFL season was the 57th regular season of the National Football League. The league expanded to 28 teams with the addition of the Seattle Seahawks and the Tampa Bay Buccaneers. This fulfilled one of the conditions agreed to in 1966 for the 1970 AFL-NFL Merger, which called for the league to expand to 28 teams by 1970 or soon thereafter.