In March of 1919 the Ontario Hockey Association donated the OHA Memorial Cup to honour and remember the many young men and women who made the supreme sacrifice for Canada in World War I. The Memorial Cup has since been awarded to Canada's National Junior Champions.
Note: You will only find here the years from 1919 to 1970 because..... In 1971, Junior 'A' Hockey was divided, to form a 'Major Junior' and a 'Tier II' level. The 'Major Junior' continues to play for the Memorial Cup. The 'Tier II' level, commonly referred to as 'Junior A', play for a new National Championship Trophy, The Manitoba Centennial Cup.enjoy, Paul C. Beugeling
1920 - 1924 teams play a two game, total goals, series.
1925 - 1936 teams now play a best-of-three game series. Overtime is a full period.
In 1934 'Junior Hockey' in Canada was divided into 'A' and 'B' classifications, with the 'A' competing for the Memorial Cup.
1937 - 1942 teams now play a best-of-five game series.
1943 - 1970 teams now play a best-of-seven game series.
1967 was an important year for junior hockey in Western Canada as seven teams, including the defending Memorial Cup champion Edmonton Oil Kings, formed the Canadian Major Junior Hockey League as an attempt to establish one junior "A" league in the west.
The establishment of the CMJHL, which was the forerunner of the present Western Hockey League, created several issues including who would be eligible to represent the west in the Memorial Cup finals.
It was determined that the CMJHL teams would not have the right to participate in the playdowns for the national junior hockey championship and as a result, for the first time since 1959 a team other than the Oil Kings would represent the west in the national final.
In 1971, Junior 'A' Hockey was divided once again to form a 'Major Junior' and a 'Tier II' level. The 'Major Junior' continued to play for the Memorial Cup. The 'Tier II', commonly referred to as "Junior A", play for a new National Championship Trophy, The Manitoba Centennial Cup.
Note: Some of the info here was retrieved from ...