Final answer:
The NFL shares the most revenue among professional sports leagues in the US, with extensive revenue-sharing from television contracts, merchandising, and ticket sales outpacing the NBA, MLB, and NHL.
Step-by-step explanation:
The professional sports league in the US that shares the most revenue is the NFL (National Football League). The NFL's revenue-sharing model is among the most extensive in all professional sports, with organizations like the NBA (National Basketball Association), MLB (Major League Baseball), and NHL (National Hockey League) also sharing revenue but not to the same extent as the NFL. The league's television contracts, which are shared equally among the 32 teams, contribute significantly to this, in addition to shared merchandising and ticket sales revenue.
Fandom in sports is geographically and regionally diverse. For instance, the NFL has widespread popularity with specific teams having strong regional followings. While soccer is quickly growing in popularity and other sports such as baseball, basketball, and hockey also have their strongholds in certain parts of the United States, the NFL's shared revenue model surpasses that of the other leagues.