 The league, which started when World War II made the suspension of Major League Baseball a possibility, would eventually shift gears to become the All-American Girls Professional Baseball League, and was dissolved at the end of the 1954 season.In its 12 years of history the AAGPBL evolved through many stages.These differences varied from the beginning of the league, progressively extending the length of the base paths and pitching distance and decreasing the size of the ball until the final year of play.