They don’t care about soccer.
For whatever reason, the most popular sport on Earth never made it into the hearts and minds of Americans. (It’s probably all that baseball, right?) That’s not to say there aren’t professional soccer (known as ‘football’ in the rest of the world) leagues in the United States—they’re just not as popular as American football, baseball, basketball, and even hockey.
In the U.S., soccer is typically reserved for young children and is often played as their first team sport.