The American Association is one of the great names in the history of professional baseball leagues in the United States. The first American Association was formed in 1902 as an independent minor league for the larger cities in the midwestern area of the U.S. The original members of the league were the St. Paul Apostles, the Minneapolis Millers, the Kansas City Cowboys, the Toledo Mud Hens, the Indianapolis Indians, the Louisville Colonels, the Milwaukee Brewers, and the Columbus (OH) Senators. The following year (1903), the American Association joined the National Association of Professional Baseball Leagues (the minor league organization), and for the next half century the league was arguably the most influential minor league in all of baseball. Great players such as Ted Williams, Mickey Mantle, Willie Mays and more starred in league ballparks, and the Junior World Series was a major event in the U.S. sporting world. In 1944 more than 50,000 fans showed up for a crucial JWS game between Louisville and Baltimore.

In 1953 major league baseball saw the first movement of franchises since the turn of the century as the Boston Braves moved to Milwaukee. Over the next decade the American Association would also lose Kansas City, Minneapolis, and St. Paul to major league baseball. At the same time, minor league baseball was undergoing a serious decline. In earlier years, minor league teams could exist without a major league working agreement, but the economics of minor league baseball had changed. It was now imperative to have a major league agreement for a team’s survival, but the major leagues were streamlining their list of affiliates. The advent of television, air conditioning, and the suburbs were also a factor in the decline of the minors, and in 1963, the American Association would close its doors. The surviving teams were absorbed by the Pacific Coast League and the International League, the remaining AAA leagues.

In 1969 the American Association returned as the expansion of major league baseball created a need for more Class AAA farm clubs. The original six members of the returning Association were the Indianapolis Indians, the Omaha Royals, the Tulsa Oilers, the Denver Bears, the Iowa Oaks, and the Oklahoma City 89ers. The following year the league would go to eight clubs with the addition of Wichita and Evansville. The league remained fairly stable until 1997 when minor league baseball decided to realign and the American Association was again dropped. As in the prior demise of the league, teams would be absorbed by the other two AAA leagues.

In the fall of 2005 the possibility of a revival of the American Association was discussed. Teams from two independent leagues, the Northern League and the Central League proposed coming together to form a “super” independent league. Two of the cities in the discussions, St. Paul and Ft. Worth, had been members of the old American Association, and the geography was similar to that of original league. With the history and precedent set by its namesake, the American Association of Independent Professional Baseball Leagues was formed on October 11, 2005. The expectations were strong for the new league, and the name “American Association” was again part of the great history of professional baseball. In 2008, Wichita rejoined the league as an expansion team along with Grand Prairie, TX. In 2011 Amarillo replaced Pensacola and the league expanded by four teams, adding the Fargo-Moorhead RedHawks, Gary SouthShore RailCats, Kansas City T-Bones and Winnipeg Goldeyes. In 2017, the Cleburne (TX) Railroaders will join the league, playing in a new $25 million stadium. Cleburne is part of the dynamic Dallas-Fort Worth metroplex.

The league expanded to suburban Chicago in 2018 with the addition of the Chicago Dogs, whose home stadium is Impact Field, a new $60 million facility in Rosemont, IL. In 2019, the American Association expnded again, this time to Franklin, WI as the Milwaukee Milkmen join the circuit. The club opened newly constructed Routine Field, which is part of the Ballpark Commons development in Franklin.