While relocation and expansion occurred frequently in its early years, the NHL is famous for its "Original Six" period which spanned from 1942 through 1967, despite only one of those clubs, the Canadiens, actually being an original league team. Along with the Canadiens, the Boston Bruins, Chicago Black Hawks, Detroit Red Wings, New York Rangers, and Toronto Maple Leafs all belong to this historical and traditional group of franchises. In 1967 the NHL doubled in size by adding six expansion teams and rapidly grew from there adding two more teams in each of the 1971, 1973, and 1975 seasons. A merger with the World Hockey Association added four in 1979 and further expansion took place throughout the 1990s when nine additional teams joined the fold. The Montreal Canadiens are the all-time leaders in Stanley Cup championships having won 24, the Toronto Maple Leafs come in second with 11.