The
National Hockey League (NHL) undertook
a major expansion for the 1967–68 season. Six new franchises were added to double the size of the league, making this expansion the largest (in terms of the number of teams created) ever undertaken at one time by an established major sports league. The expansion marked the first change in the composition of the league since
1942, when the
Brooklyn Americans folded, thereby ending the era of the
Original Six.