The United States has an estimated 57 million Spanish speakers, about 42 million being their native language - that's more than both Spain and Argentina. I'm unsure of how growth in Spanish broadcasting suggests it's not from within the United States.

You also currently have the Leagues Cup being broadcast on AppleTV which is a one month tournament of every LigaMX (Mexico) and MLS (USA) club with a $40-million prize pool.

My uneducated guess is that it's a mix of Leagues Cup, global superstars signing with MLS clubs, young stars such as Thiego Almada in Atlanta who just won a World Cup, and MLS beginning to overtake LigaMX in quality that is drawing more and more viewers recently - many of which are likely Spanish speaking.

I'd point toward tonight's quarter-final elimination match against LAFC and Monterrey as an example that is likely to draw a ton of Spanish commentary views.