League for women's baseball teams in the United States
The All-American Girls Professional Baseball League (AAGPBL) was a professional women's baseball league founded by Philip K. Wrigley, which existed from 1943 to 1954. The AAGPBL is the forerunner of women's professional league sports in the United States. Over 600 women played in the league, which eventually consisted of 10 teams located in the American Midwest. In 1948, league attendance peaked at over 900,000 spectators. The most successful team, the Rockford Peaches, won a league-best four championships.
https://en.wikipedia.org/wiki/All-American_Girls_Professional_Baseball_League