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The National Hockey League (NHL) went through an expansion for the 1967–68 NHL season. It added six new teams, which already had six teams in it. This marked the first change in the composition of the league since 1942. It was the end of the Original Six era in the NHL, which had happened since 1942.
The expansion process began in March 1965, when NHL President Clarence Campbell announced that the league proposed to expand its operations through the formation of a second six-team division.