The document discusses the history and development of several professional soccer leagues, including the English Premier League established in 1863, the Japanese J-League founded in 1993 to replace the Japan Soccer League, and the Thai Premier League which was established in 1996 and is a member of the Asian Football Confederation. The document also includes a table comparing the sources of revenue for Manchester United in 1997 and 2005, with commercial revenue becoming a larger source of income over time.