user: Question: In which round was Position G  from the United States drafted as Pick 13 in 1971-1 1971?
Columns: ['Draft', 'Round', 'Pick', 'Nationality', 'Position', 'College/High School/Club']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1948-1 1948', '1', '9', 'United States', 'Unknown', 'California']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Nationality" = 'United States' AND "Position" = 'G' AND "Pick" = '13' AND "Draft" = '1971-1 1971';