History of the National Hockey League

The history of the National Hockey League begins with the end of its predecessor league, the National Hockey Association (NHA), in 1917. After unsuccessfully attempting to resolve disputes with Eddie Livingstone, owner of the Toronto Blueshirts, executives of the three other NHA franchises suspended the NHA, and formed the National Hockey League (NHL), replacing the Livingstone team with a temporary team in Toronto, the Arenas.

Source: Wikipedia — History of the National Hockey League (CC BY-SA 4.0)