An original member of the American Football League (AFL), the Patriots joined the NFL in the 1970 merger of those leagues. The team advanced to the playoffs four times before appearing in Super Bowl XX in January 1986, losing to the Chicago Bears. The team also appeared in Super Bowl XXXI in 1997, losing to the Green Bay Packers. Between 2000 and 2005, the Patriots became the second team in NFL history (after the Dallas Cowboys) to win three Super Bowls in four years (Super Bowl XXXVI, XXXVIII, and XXXIX), and the eighth to win consecutive Super Bowls. Their success in the early part of the decade to present has prompted many to dub the team as a modern NFL dynasty.