What changes led to more Americans watching professional sports in the early 1900

Very few sports were professional in 1900. The invention of TV contributed to surge in watching of football starting in the late 1960's. Fighting was always on TV since the 1950's and use to be on every Friday night. Today basketball and football replace the Friday Night Fights. As TV has gotten better and there are more channels to watch it has allowed sports only channels to be on the dial. The more people watching the more is made by the franchises and added into the mix the things like Super Bowl also are able to draw people. Now, the NFL is running camps for kids to get them into football and boost their future ticket buyers. The NFL made 64 billion last year and none of it was taxed. Making money like that is also power.