When was the National Hockey League (NHL) founded?

The National Hockey League (NHL) was founded in 1917 following the demise of its predecessor league, the National Hockey Association (NHA). In an effort to remove Eddie Livingstone as owner of the Toronto Blueshirts, a majority of the NHA franchises (the Montreal Canadiens, Montreal Wanderers, Ottawa Senators and Quebec Bulldogs) suspended the NHA and formed the new NHL. Quebec, while a member, did not operate in the NHL for the first two years. Instead the owners of the Toronto Arena Gardens operated a new Toronto franchise. While the NHL was intended as a temporary measure, the continuing dispute with Livingstone led to the four NHA owners meeting and making the suspension of the NHA permanent one year later.

The NHL's first quarter-century saw the league compete against two rival major leagues, the Pacific Coast Hockey Association and Western Canada Hockey League, for players and the Stanley Cup. The NHL first expanded into the United States in 1924 with the founding of the Boston Bruins, and by 1926 consisted of ten teams in Ontario, Quebec, the Great Lakes region, and the Northeastern United States. At the same time, the NHL emerged as the only major league and the sole competitor for the Stanley Cup.