The Seattle Seahawks joined the National Football League (NFL) in 1976 as an expansion team. The Seahawks have won 10 divisio ... n titles and three conference championships. They are the only team to have played in both the American Football Conference (AFC) and the National Football Conference (NFC) championship games. They have appeared in three Super Bowls, (Super Bowl XL, Super Bowl XLVIII and Super Bowl XLIX). The Seahawks defeated the Denver Broncos, 43-8, in Super Bowl XLVIII to win their first title. The team plays at CenturyLink Field in downtown Seattle. read more