However, after the North American League folded at the end of the 2012 season, ULB was reformed.

The league began its first season on May 16, 2006, with six teams: the Alexandria Aces, Amarillo Dillas, Edinburg Coyotes, Laredo Broncos, Rio Grande Valley WhiteWings and San Angelo Colts.

The league played an 80-game season from late May to the middle of August, and featured the Edinburg Roadrunners, the Fort Worth Cats, the Rio Grande Valley WhiteWings, the San Angelo Colts, the Texas Thunder, and the Alexandria Aces.

The San Angelo Colts announced on July 2, 2014, that they had filed for Chapter 11 bankruptcy protection.

[1] Although it was stated at the time that operations would not be affected, the team announced on August 11, 2014, that the final eight games of the 2014 regular season would not be played.

[3] The United League Baseball was looking into possibly expanding to Del Rio, Texas, and was scheduled to meet with city officials in October 2014.

Format: for the 2008 season the United League playoffs will consist of 4 teams competing in 2 rounds.