ior to 1946, the top level of Minor League Baseball was Double-A, which had been established in 1912.:?236? The Triple-A classification was created before the 1946 season, and began with all three leagues then in Double-A moving up to the new level::?15? American Association (AA) International League (IL) Pacific Coast League (PCL) This structure persisted for the next 75 years with only a few changes: 1952–1957: The PCL was classified as "Open" for these six seasons, in anticipation of it potentially becoming a third major league; once the Brooklyn Dodgers and New York Giants relocated from New York City to California, the PCL returned to Triple-A for the 1958 season.:?16,?497? 1963–1968: The AA did not operate during these six seasons.:?521,?541? 1967: The Mexican League received Triple-A classification;:?537? it had previously been Double-A since 1955:?481? 1979: The Inter-American League debuted with a Triple-A classification; the league disbanded in June:?587? 1998: Teams from the AA, which disbanded after the 1997 season, were added to the PCL and IL The IL, PCL, and Mexican League continued as Triple-A leagues until Major League Baseball reorganized the minor leagues prior to the 2021 season. At that time, the IL and PCL were temporarily renamed Triple-A East and Triple-A West, respectively. The Mexican League continues to operate, independently. Following MLB's acquisition of the rights to the names of the historical minor leagues, they announced on March 16, 2022, that the leagues would once again be called the International League and the Pacific Coast League, effective