Minor League Baseball is a hierarchy of baseball leagues such as the International League, the Pacific Coast League, and the Mexican League.
 Leagues in the NA would not be truly called minor until Branch Rickey developed the first modern farm system in the 1930s
=== Triple-A ===This classification currently includes two affiliated leagues: the 20-team International League and the 10-team Pacific Coast League (known as Triple-A East and Triple-A West, respectively, for the 2021 season)

