In terms of seniority it rested immediately beneath the IRB sponsored North America 4, a former US/Canadian cross-border competition in which two Canadian teams (Canada East and Canada West) took part.

Most players took part in RCSL ("Super League") on an amateur basis.

It is considered to be Canada's premier wholly domestic rugby competition.

[citation needed] Players on Canada's senior men's team were often chosen from Super League clubs.

("The Venom") and the Manitoba Rugby Union ("The Buffalo") elected not to participate, which created an unbalanced situation where the Western Division had five teams (therefore only four games in their season), while the Eastern Division had seven (six games).