The Manitoba Centennial Trophy was presented to the Canadian Amateur Hockey Association (CAHA) by the Manitoba Amateur Hockey Association (MAHA) to commemorate their centennial year of 1970. At that time, the CAHA reconfigured their junior tiers, creating two separate classifications – Major junior and Junior A. The major junior teams were grouped into the three regional leagues that made up the Canadian Major Junior Hockey League (CMJHL), while the Junior A tier included the remaining junior teams in the provincial/regional leagues that later formed the Canadian Junior Hockey League. It was determined that the Memorial Cup, which had served as the CAHA's national championship tournament, would become the new championship trophy for the CMJHL while the Manitoba Centennial Trophy served as the trophy for the champions of the new Junior A division. Earl Dawson and Bill Addison were the named the initial trustees of the trophy, both of whom were past presidents of the MAHA. The tournament subsequently became known as the Centennial Cup.