user: Question: Which sport did the United States win?
Columns: ['Year', 'Fighter', 'Nation represented', 'Sport', 'Sanctioning body or league', 'Weight class represented or contested']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [2007.0, 'Floyd Mayweather Jr', 'United States', 'Boxing', 'Not applicable', 'Welterweight']
SQL:

assistant: SELECT "Sport" FROM "Table" WHERE "Nation represented" = 'United States';