<P> The league was formed in 1933 with the partition of Junior A and B. In 1970, the OHA Junior A League was one of five Junior A leagues operating in Ontario . The OHA was promoted to Tier I Junior A for the 1970 - 71 season and took up the name Ontario Major Junior Hockey League . In 1980, the league walked away from Ontario Hockey Association governance with the creation of the Canadian Major Junior Hockey League and its direct affiliation with Hockey Canada . </P> <P> From 1974 until 1978 (as the Ontario Major Junior Hockey League), Clarence "Tubby" Schmalz was the league's commissioner . Then, for one season (1978--79), former IHL commissioner Bill Beagan served as commissioner of the OMJHL . Beginning with the 1979 - 80 season, David Branch has been the Commissioner of the OHL (which became the league's official name prior to the 1981 - 82 season). Branch was appointed on August 11, 1979, and assumed the commissioner's role on September 17, 1979 . Since 1980 the league has grown rapidly into a high - profile marketable product, with many games broadcast on television and radio . </P> <P> There are currently 20 teams in the OHL: 17 are based in the Canadian province of Ontario, two teams in the American state of Michigan, and one team in the American state of Pennsylvania . </P> <P> Leagues for ice hockey in Ontario were first organized in 1890 by the newly created Ontario Hockey Association (OHA). In 1892 the OHA recognized junior hockey - referring to skill rather than age . In 1896 the OHA moved to the modern age - limited junior hockey concept, distinct from senior and intermediate divisions . Since then the evolution to the Ontario Hockey League has developed through four distinct eras of junior - aged non-professional hockey in Ontario . In 1933, the junior division was divided into two levels, Junior A and Junior B. In 1970 the Junior A level was divided into two levels, Tier I (or Major Junior A) and Tier II (or Minor Junior A). In 1974 the Tier I / Major Junior A group separated from the OHA and became the independent' Ontario Major Junior Hockey League' (OMJHL). In 1980, the OMJHL became the' Ontario Hockey League .' </P>

How many american teams are in the ohl