Countries are good at the sports they're good at because those were sports developed for and by and made up of poor people. Baseball: a stick, a ball, and a meadow or empty lot. Basketball, inner city black kids playing in the park. Etc.

Soccer in the US never quite got the same treatment because it was never adopted by the poor and marginalized at a mass scale. In Argentina, you get rags and stuff them into a sock to make a ball, put up two cones and you have a street game. Laborers played them on the dock yards of the Rio de La Plata. Militant labor unions formed the first semi professional clubs and leagues.

Soccer in the US was either a middle class sport where semi well off kids got driven in vans from the burbs to games, ate oranges at half time, and had pizza after. Not like Maradona sniffing glue and skipping school to play futbol.

Until and unless it becomes the sport of the poor and marginalized, the US won't be dominant in it.

Internationally too, a system developed with commonalities across the globe that continue unshared with the US.

Finally, where Soccer has taken root is as a way of complying with title 9 and funded by schools in the form of girls and women's soccer. That's why the US is a dominant women's soccer country. Because many women got scholarships to play soccer so that colleges or high schools weren't sued due to a lack of women's extracurricular activities.