The Major League Agreement was the successor of the 1903 National Agreement. Adopted in 1920, it confirmed the existing close cooperation between the National League and American League and created the position of Commissioner, replacing the National Commission as the major league's chief executive authority. It is the direct ancestor of today's Major League Baseball as a single legal entity.
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Win Expectancy, Run Expectancy, and Leverage Index calculations provided by Tom Tango of InsideTheBook.com, and co-author of The Book: Playing the Percentages in Baseball.
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Full-year historical Major League statistics provided by Pete Palmer and Gary Gillette of Hidden Game Sports.
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