The radio was invented in the 1920s, allowing us to hear the commentary during games.
because of the Red Scare and they were against the increasing immigration.
because they were Probably because everything comes and goes and ends up unpopular at some point.
I think it was because of the rising economy and finally being able to afford stadiums ect.
POP:it stands for popular so pop sports mean popular sports
Boxing became popular because people wanted to take their anger out on other people so they decided to make it a legal thing, a sport.
There wasn't any tv in the 1920s. The first public demonstration was in the 1920s, though, so you can search "first tv ever".
1920s or even earlier.
It is not as popular as a lot of other sports so, no.
Probably so that sports fans can watch it, maybe it will become more popular etc.
Because they are so popular