The two most successful sports franchise world wide are the New York Yankees of American Major League Baseball, and the Manchester United soccer club in England.
Edit: Manchester United aren't even the most successful English team, that is Liverpool FC. In Europe, Real Madrid are considered the most successful with FIFA voting them the most successful club of the 20th century.
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The most successful sports team in Guinness World Records is the New Zealand national Rugby union team, known as the All Blacks. They have a consistently high winning percentage in international matches and have won the Rugby World Cup multiple times.