The World Hockey Association was a major professional ice hockey league that operated in North America from 1972 to 1979. It was the first major competition for the National Hockey League since the collapse of the Western Hockey League after the 1925-26 WHL season. Although the WHA was not the first league since that time to attempt to challenge the NHL's supremacy, it was by far the most successful.
In fact, the WHA was home to many of hockey's all-time greats, including Bobby Hull, Gordie Howe, Wayne Gretzky, Frank Mahovlich, Mark Messier, Mike Gartner, Michel Goulet and many more.
The WHA also spawned four NHL franchises: The Hartford Whalers, Edmonton Oilers, Winnipeg Jets and Quebec Nordiques