In 1915, the Pittsburgh Yellow Jackets of the United States Amateur Hockey Association (USAHA) were founded. The team evolved from being an amateur to a semi-pro franchise. The Pittsburgh Athletic Associations's Seven, an amateur hockey club, as well as the Carnegie Tech hockey club and the University of Pittsburgh hockey team also played their home games at the Gardens in 1919. By 1924, the Yellow Jackets of the USAHA's Western Division were so dominant that they spun off another Pittsburgh team, the Hornets, who played in the Eastern Division. In 1925, both Pittsburgh club's won the respective divisions and played each other for the 1924-1925 USAHA championship at the Gardens. The Yellow Jackets won the title in a best of seven series, 4 games to none.