Uncommon
Timeline of the National Hockey League
The following is a complete history of organizational changes in the National Hockey League (NHL). The NHL was founded in 1917 as a successor to the National Hockey Association (NHA), starting out with four teams from the predecessor league, and eventually grew to thirty-two in its current state. The NHL has expanded and contracted numerous times throughout its history, including in 1979 when four teams were added from the World Hockey Association (WHA).
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