I think the mainstream media in Britain gives boxing good coverage. Anthony Joshua for instance, seems to get really good exposure from the media. The mainstream American media is very selective with fighters though; they largely don't seem to be interested in combat sports unless it's Mayweather, Pacquiao or Ronda Rousey. They've began to give Wilder more coverage though.
basketball Nfl and baseball are the main sports in America... Remember... 1state is bigger than the whole united kingdom
But in England, Football, Rugby, Cricket and Tennis are bigger than Boxing. Boxing is in a very good place in England though.