I think it’s interesting how largely immune to the soccer craze the United States is. It’s kind of like how ABBA was a huge hit everywhere on Earth except for the U.S.
The US has had some peaks and valleys with interest. MLS has actually been around for 25 years now and I’m reasonably sure it’s fairly successful (granted I don’t follow it but it’s still around and it gets decent tv coverage). And interest does spike during most World Cup years, especially when the US is good (relatively speaking). Women’s World Cup was very popular last time out IIRC, especially given that we won the thing somehow.
EDIT: Looking at the short-lived history of the Women’s WC, we’ve done quite well. What’s up with that, rest of the world?