Since we are in the media age, many US citizens watch television or films.
Many of these films may have latin music, therefore making US citizens more exposed to the music.
It is also because in the USA they are educated to learn Spanish as their second language, so films with latin music will encourage people trying to learn spanish to listen to music, because they will get a feel for the words perhaps.
Remember to do a bit of research on your own about popular films with latin music.
I hope this helped!