This continued expansion was partially brought about by the creation of the World Hockey Association (WHA), which operated from 1972 until 1979 and sought to compete with the NHL for markets and players.
When the WHA ceased operations in 1979, the NHL absorbed four of the league's teams—the Edmonton Oilers, Hartford Whalers, Quebec Nordiques and Winnipeg Jets.
This brought the NHL to 21 teams (the Cleveland Barons had ceased operations in 1978), a figure that remained constant until the San Jose Sharks joined as an expansion franchise in 1991.
The Los Angeles Kings, Minnesota North Stars, California Seals, Philadelphia Flyers, Pittsburgh Penguins and St. Louis Blues began play in the 1967–68 season.
The Kings bought the Springfield Indians of the American Hockey League the night before the expansion draft, leading the Flyers to purchase the Quebec Aces.
[9] On January 13, 1968, North Stars' rookie Bill Masterton became the first and, to date, only player to die as a result of injuries suffered during an NHL game.
[10] Early in a game against the Seals, Masterton was checked hard by two players, Ron Harris and Larry Cahan, causing him to flip over backwards and land on his head.
[14] A gifted scorer, Orr revolutionized the impact defencemen have on the offensive aspect of the game, as blue-liners began to be judged on how well they created goals in addition to how well they prevented them.
[20] The league also gave the Sabres and Canucks the first two picks in each round of the 1970 NHL Amateur Draft, offering them a better opportunity to build their rosters than the 1967 expansion teams had.
Bernie Parent, Gerry Cheevers, Johnny McKenzie and Rick Ley jumped to the WHA as the NHL suddenly found itself in a war for talent.
The Bruins attempted to restrain Cheevers and Sanderson from joining the WHA, though a United States federal court refused to prohibit the signings.
[28] In November 1972, a Philadelphia district court placed an injunction against the NHL, preventing it from enforcing the reserve clause and freeing all players who had restraining orders against them, including Hull, to play with their WHA clubs.
Prime Minister Pierre Trudeau sent a telegram to NHL president Clarence Campbell, expressing his "intense interest which I share with millions of Canadians ... that Canada should be represented by its best hockey players, including Bobby Hull".
Paul Henderson scooped up the rebound and put it past the fallen Soviet goalie to score the goal that won the game, 6–5, and the series.
Red Army was persuaded to complete the game after Alan Eagleson threatened to withhold their appearance fee if the team did not return to the ice.
On February 7, 1976, Maple Leafs star Darryl Sittler set an NHL record, scoring 10 points in one game in an 11–4 victory over the Bruins.
Bobby Hull declared that a merger was "inevitable", though WHA president Bill MacFarland stated that his league had no interest in joining with the NHL.
[52] In 1976, for the first time in four decades, the NHL approved franchise relocations; the Scouts moved after just two years in Kansas City to Denver to become the Colorado Rockies, while the California Golden Seals became the Cleveland Barons.
Fans across Canada quickly organized a boycott of Molson products, while the House of Commons unanimously passed a motion urging the NHL to reconsider.
[58] The WHA folded following the 1978–79 season, and the Edmonton Oilers, New England Whalers, Quebec Nordiques and Winnipeg Jets joined the NHL as expansion teams.
[69] With the likes of Billy Smith, Mike Bossy, Denis Potvin, and Bryan Trottier, the Islanders dominated both the regular season and the playoffs.
Edmonton's hopes for a third consecutive title in 1986 were dashed by their provincial rival, the Calgary Flames, after Oilers' rookie Steve Smith accidentally bounced the series-winning goal off goaltender Grant Fuhr and into his own net.
[81] The NHL quickly announced three new teams: the San Jose Sharks, who began play in the 1991–92 season, and the Ottawa Senators and Tampa Bay Lightning, who followed a year later.
[82] The Sharks' creation forestalled a unilateral franchise move by North Stars owners George and Gordon Gund to the San Francisco Bay Area.
With future Hall of Famers Grant Fuhr, Paul Coffey, Jari Kurri, Mark Messier, and Glenn Anderson, they established numerous new scoring records.
[83] He proved his critics wrong, scoring 137 points in 1979–80 and winning the first of nine Hart Trophies (including 8 consecutive awards from 1980 to 1988) as the NHL's most valuable player.
[84] On August 9, 1988, Oilers owner Peter Pocklington, in financial trouble, traded Gretzky, along with Marty McSorley and Mike Krushelnyski, to the Los Angeles Kings in exchange for Jimmy Carson, Martin Gelinas, US$15 million and three first-round draft picks.
[92] Czech teenager Petr Nedved walked into a Calgary police station in January 1989 after playing in the Mac's AAA midget hockey tournament.
[94] Shortly before the end of the 1988–89 regular season, Flames general manager Cliff Fletcher announced that he had reached an agreement with Soviet authorities that allowed Sergei Pryakhin to play in North America.
After the Canadiens took Rejean Houle and Marc Tardif, the rest of the league voted to end the rule in 1970, just before future star Gilbert Perreault was selected first in the 1970 expansion draft by the Buffalo Sabres.