user: Question: What is Finish, when Country is "United States", and when To Par is "+21"?
Columns: ['Player', 'Country', 'Year(s) won', 'Total', 'To par', 'Finish']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Billy Casper', 'United States', '1959', 278.0, '–2', '1']
SQL:

assistant: SELECT "Finish" FROM "Table" WHERE "Country" = 'United States' AND "To par" = '+21';