In 1972, the World Hockey Association (World Hockey Association) was established, although it has never threatened the status of the Stanley Cup, but its identity has not yet been potential competitors NHL ignored. In view of this, NHL decided to fully implement its expansion plans in order to respond, the new team of the New York Islanders in the same year, the Atlanta Flames, after two years of investigation and new Kansas home team and the Washington Capitals. Two league fans and players compete until 1979 WHA disbanded. The remaining four WHA teams joined the NHL: Harvard whalers team, the Edmonton Oilers, Winnipeg Jets, Quebec Nordic team.
In the early 1990s, NHL added a further five teams. San Jose Sharks joined in 1991; a post season, the Ottawa Senators and Tampa Bay Lightning team with the league. In 1993, Anaheim Duck Ham team and the Florida Panthers also join the alliance. Close to 2000 when, NHL has added four teams: Nashville Predators team (1998), Atlanta Thrashers (1999), Minnesota Wild team, the Columbus Blue Jackets team (both in 2000), a total of 30 teams.