WHL: 1921-1926 (6 seasons)
Centered in smaller cities, WHL teams eventually resorted to selling players to their richer NHL rivals to stay afloat.
PCHA: 1912-1924 (13 seasons)
Oriented in western Canada and the western U.S., eventually merged with the Western Canada Hockey League (WHL)
NHL: 1918- (103 seasons)
Founded to replace the NHA. Expanded into the U.S. in 1924 to emerge as the sole North American hockey league.
NHA: 1910-1918 (9 seasons)
NHA suspended operations in order to oust unwanted owner . Remaining league owners then started today's NHL.
CHA: 1910-1910 (1 season)
Three teams from ECHA formed the new CHA, which only lasted a few weeks, as two of the teams quickly moved to NHA.
ECHA: 1908-1909 (2 seasons)
Shed its amateur status in 1908, leading to amateurs playing for the Allan Cup, and professionals playing for Stanley Cup.
OPHL: 1908-1911 (4 seasons)
Sometimes referred to as the Trolley League, rose in popularity followning collapse of the IHL.
MPHL: 1905-1908 (4 seasons)
Started as Mabitoba Hockey Association (MHA), an elite amateur league in 1892, turning professional as the WPHL in 1905.
FHL: 1904-1909 (6 seasons)
Formed to provide a league for teams not accepted by the rival CAHL, but dissolved with the formation of the NHA.
IHL: 1904-1907 (4 seasons)
The first fully professional league, instrumental in changing the nature of ice hockey from amateur to professional.
WPHL: 1896-1910 (15 seasons)
The pre-eminent ice hockey league in the U.S., it was the first organization to openly hire and trade players.
CAHL: 1899-1905 (7 seasons)
Early men's amateur hockey league, with a growing focus on revenues. Replaced the organization that was AHAC.
AHAC: 1886-1898 (13 seasons)
Organized to provide a longer season to determine the Canadian champion, the first winner of the newly introduced Stanley Cup.