List of pre-World Series baseball champions

The modern World Series, the current championship series of Major League Baseball (MLB) between teams of the National League and the American League, began in 1903, and was established as an annual event in 1905. This article discusses major-league champions before 1905, including championship series contested in that era, primarily between teams of the National League and the American Association.

Source: Wikipedia — List of pre-World Series baseball champions (CC BY-SA 4.0)