This league had been the Cape Breton Senior Hockey League for over a decade before it became a Major league in 1950-51. This was the first year that the Canadian Amateur Hockey Association had this level of play. The member teams were eligible for the Alexander Cup. Being Major meant that the teams could sign both professionals and amateurs. Previously the teams could only use amateurs. The league only lasted this one season. After the league folded, the Sydney Millionaires and the Glace Bay Miners joined the Maritime Major Hockey League.