What is the number-one spectator sport in the United States?

The number-one spectator sport in the United States is football, particularly the NFL, which consistently attracts the most viewers for its games, especially during the Super Bowl. Football has a strong cultural presence and wide-ranging fan engagement, making it the most popular sport in terms of viewership and attendance.

While horse racing has historical significance and has had its peak moments, it does not currently compete with the viewer numbers and overall spectator enthusiasm seen in football, basketball, or baseball events. Basketball, particularly the NBA, and baseball, with its long-standing traditions, both have large followings, but they still do not match football's widespread popularity in terms of attendance and television ratings.

In summary, football stands out as the leading spectator sport in the United States, showcasing the highest engagement levels from fans across the country.