The 1979 NHL expansion was the culmination of several years of negotiations between the National Hockey League (NHL) and the World Hockey Association (WHA) that resulted in the WHA and all of its surviving franchises folding in return for the owners of four of the WHA's six remaining teams (the Edmonton Oilers, New England Whalers, Quebec Nordiques, and Winnipeg Jets) being granted expansion franchises that commenced play in the NHL for the 1979–80 season. The agreement officially took effect on June 22, 1979. The agreement ended the seven-year existence of the WHA and re-established the NHL as the lone major league in North American professional ice hockey.