In just about every conceivable way, the NFL is the king of the modern-day American sports world. The league is talked about throughout the year and is often dominating headlines (sometimes positive, sometimes not), even when there is no actual football to be played.
Soccer is certainly the biggest sport from a global perspective, but it remains an afterthought to the majority of American sports fans.
The NBA is big in the states, although, not as popular as the NFL. And while the NFL edges the NBA in almost every viewership metric, there is one thing that the NBA does far better than the NFL.