Is MLS truly a major league in the US? It depends where you are
theguardian.com
theguardian.com
Hey, Sports Reference. They ran a graphic last year that showed the most-viewed team pages on their FBRef subsite in 2022.[1] Not a spoiler to say MLS didn't do well; their teams didn't rank in in-market states, including Oregon (NWSL's Thorns FC), Colorado (Crystal Palace), Minnesota (the US national team), California, Washington, Illinois (Chelsea), Florida (Liverpool), New York (Man City), and New Jersey (Liverpool).
So... MLS maybe still has a ways to go.
1: https://the18.com/en/soccer-entertainment/us-map-most-viewed...
It might make me fall in love with the game, however, because I have seen how relegation is a high stakes event for teams and the fans
https://www.theguardian.com/football/2023/feb/18/everton-lee...
Similarly promotion is an event better than your team winning the Superbowl.
MLS in the US, however, is like the NFL in that it has no relegation. Certainly some NFL games are badly mismatched and frequently I wind up wearing Giants gear towards the end of the season because the Giants fans I know don't want to be seen in public with it.
Amusingly, Chelsea's women's coach thinks England's league should look into the US model without pro/rel: https://www.90min.com/posts/emma-hayes-wsl-should-be-open-fr...
England in particular's struggled with pro/rel in the women's game because from a financial sustainability standpoint, there's effectively no place to promote from or relegate to -- if you aren't Liverpool or Man United, promotion can be a financial bullet to the head. And if you're Liverpool, the stakes of relegation are next to nil, but if you're Doncaster, the stakes are utter destruction and demotion past the second and third tiers because of unattainable financial requirements. (Mexico's leagues, men's and women's, have had similar problems with pro/rel.)
The US has a similar, more systemic problem on the women's side. Even with new pro second-division leagues starting, our real women's second division is the NCAA, with all the legal baggage that carries.